diff --git a/server/app.py b/server/app.py
index 724c908..c073043 100644
--- a/server/app.py
+++ b/server/app.py
@@ -479,6 +479,8 @@ def get_settings():
         settings["strip_keywords"] = True
     if "clean_subtitle_content" not in settings:
         settings["clean_subtitle_content"] = True
+    if "clean_subtitle_garbage" not in settings:
+        settings["clean_subtitle_garbage"] = False
     if "clean_subtitle_force_remove" not in settings:
         settings["clean_subtitle_force_remove"] = ["YTS", "OpenSubtitles"]
     if "omdb_enabled" not in settings:
@@ -537,6 +539,8 @@ def update_settings():
             db.set_setting("strip_keywords", bool(data["strip_keywords"]))
         if "clean_subtitle_content" in data:
             db.set_setting("clean_subtitle_content", bool(data["clean_subtitle_content"]))
+        if "clean_subtitle_garbage" in data:
+            db.set_setting("clean_subtitle_garbage", bool(data["clean_subtitle_garbage"]))
         if "clean_subtitle_force_remove" in data:
             db.set_setting(
                 "clean_subtitle_force_remove",
@@ -1534,6 +1538,57 @@ def search_title():
 
 # ============ PROCESSING ENDPOINTS ============
 
+@app.route('/api/clean/preview', methods=['POST'])
+def preview_clean():
+    """Preview cleaning changes for a subtitle file without writing."""
+    try:
+        data = request.json
+        file_path = data.get("file")
+
+        if not file_path:
+            return jsonify({
+                "success": False,
+                "error": "No file specified"
+            }), 400
+
+        clean_subtitle_content = _get_bool_setting("clean_subtitle_content", True)
+        clean_subtitle_garbage = _get_bool_setting("clean_subtitle_garbage", False)
+
+        if not clean_subtitle_content and not clean_subtitle_garbage:
+            return jsonify({
+                "success": False,
+                "error": "Cleaning is disabled in settings"
+            }), 400
+
+        processor_instance = processor or SubtitleProcessor(
+            omdb_client,
+            tmdb_client,
+            tvmaze_client,
+            wikipedia_client,
+            preferred_source=_get_str_setting("preferred_source", "omdb"),
+        )
+
+        preview = processor_instance.preview_clean_file(
+            file_path,
+            clean_subtitle_content=clean_subtitle_content,
+            clean_subtitle_garbage=clean_subtitle_garbage,
+        )
+
+        if not preview.get("success"):
+            return jsonify(preview), 400
+
+        return jsonify({
+            "success": True,
+            "preview": preview
+        })
+
+    except Exception as e:
+        logger.error(f"Preview clean error: {e}")
+        return jsonify({
+            "success": False,
+            "error": str(e)
+        }), 500
+
 @app.route('/api/process', methods=['POST'])
 def process_files():
     """Process selected files to add plot summaries"""
@@ -1575,6 +1630,7 @@ def process_files():
 
         # Load clean_subtitle_content setting (default True for ad removal)
         clean_subtitle_content = _get_bool_setting("clean_subtitle_content", True)
+        clean_subtitle_garbage = _get_bool_setting("clean_subtitle_garbage", False)
 
         # Load default insertion position and preferred source
         default_insertion_position = _get_str_setting("insertion_position", "start")
@@ -1603,6 +1659,7 @@ def process_files():
                     result = processor_instance.clean_file(
                         file_path,
                         clean_subtitle_content=clean_subtitle_content,
+                        clean_subtitle_garbage=clean_subtitle_garbage,
                     )
                     result["clean_only"] = True
                 else:
@@ -1614,6 +1671,7 @@ def process_files():
                         format_options=effective_format,
                         strip_keywords=strip_keywords,
                         clean_subtitle_content=clean_subtitle_content,
+                        clean_subtitle_garbage=clean_subtitle_garbage,
                         insertion_position=insertion_position or default_insertion_position,
                         preferred_source=preferred_source or default_preferred_source,
                         language=language,
@@ -1742,6 +1800,7 @@ def process_batch():
 
             # Load clean_subtitle_content setting (default True for ad removal)
             clean_subtitle_content = _get_bool_setting("clean_subtitle_content", True)
+            clean_subtitle_garbage = _get_bool_setting("clean_subtitle_garbage", False)
 
             default_insertion_position = _get_str_setting("insertion_position", "start")
             default_preferred_source = _get_str_setting("preferred_source", "omdb")
@@ -1776,6 +1835,7 @@ def process_batch():
                         format_options=effective_format,
                         strip_keywords=strip_keywords,
                         clean_subtitle_content=clean_subtitle_content,
+                        clean_subtitle_garbage=clean_subtitle_garbage,
                         insertion_position=insertion_position or default_insertion_position,
                         preferred_source=preferred_source or default_preferred_source,
                         language=language,
diff --git a/server/core/keyword_stripper.py b/server/core/keyword_stripper.py
index 4f7aef8..82ed9c3 100644
--- a/server/core/keyword_stripper.py
+++ b/server/core/keyword_stripper.py
@@ -253,6 +253,13 @@ class KeywordStripper:
         r"^\s*$",
     ]
 
+    # -----------------------------
+    # OCR / GARBAGE LINE DETECTION
+    # -----------------------------
+
+    GARBAGE_MUSIC_LINE = r"^[\s\[\]\(\)\{\}_\-\.\~\*]*(?:[♪♫♬♩]+)[\s\[\]\(\)\{\}_\-\.\~\*]*$"
+    GARBAGE_TIMECODE = r"\d{1,2}:\d{2}:\d{2}[,\.]\d{3}"
+
     # -----------------------------
     # COMPILED REGEX CACHE
     # -----------------------------
@@ -296,6 +303,8 @@ class KeywordStripper:
             "subtitle_force_remove": [
                 re.compile(p, re.IGNORECASE) for p in combined_force_remove
             ],
+            "garbage_music_line": re.compile(cls.GARBAGE_MUSIC_LINE),
+            "garbage_timecode": re.compile(cls.GARBAGE_TIMECODE),
         }
 
         return cls._compiled
@@ -430,26 +439,74 @@ class KeywordStripper:
         Returns:
             Cleaned text with ads removed, or empty string if nothing remains
         """
+        return self._clean_subtitle_text(text, remove_watermarks=True, remove_garbage=False)
+
+    def clean_subtitle_text_with_options(
+        self,
+        text: str,
+        remove_watermarks: bool = True,
+        remove_garbage: bool = False,
+    ) -> str:
+        return self._clean_subtitle_text(
+            text,
+            remove_watermarks=remove_watermarks,
+            remove_garbage=remove_garbage,
+        )
+
+    def _is_timecode_line(self, line: str) -> bool:
+        rx = self._compile()
+        if not rx["garbage_timecode"].search(line):
+            return False
+        stripped = rx["garbage_timecode"].sub("", line)
+        stripped = re.sub(r"[\s0-9:\-–>,\.\[\]]+", "", stripped)
+        return stripped == ""
+
+    def _is_music_line(self, line: str) -> bool:
+        rx = self._compile()
+        return bool(rx["garbage_music_line"].match(line.strip()))
+
+    def _normalize_line(self, line: str) -> str:
+        return re.sub(r"\s+", " ", line.strip()).lower()
+
+    def _clean_subtitle_text(
+        self,
+        text: str,
+        remove_watermarks: bool = True,
+        remove_garbage: bool = False,
+    ) -> str:
         rx = self._compile()
         original = text
 
         # Process line by line to handle multi-line subtitles
         lines = text.split('\n')
         cleaned_lines = []
+        seen_lines = set()
 
         for line in lines:
+            if remove_garbage:
+                if self._is_music_line(line) or self._is_timecode_line(line):
+                    continue
+
             cleaned_line = line
 
             # Remove watermark patterns
-            for pattern in rx["subtitle_watermarks"]:
-                cleaned_line = pattern.sub("", cleaned_line)
+            if remove_watermarks:
+                for pattern in rx["subtitle_watermarks"]:
+                    cleaned_line = pattern.sub("", cleaned_line)
 
             # Clean up resulting whitespace
             cleaned_line = re.sub(r'\s+', ' ', cleaned_line).strip()
 
-            # Only keep lines that have content after cleaning
-            if cleaned_line:
-                cleaned_lines.append(cleaned_line)
+            if not cleaned_line:
+                continue
+
+            if remove_garbage:
+                normalized = self._normalize_line(cleaned_line)
+                if normalized and normalized in seen_lines:
+                    continue
+                seen_lines.add(normalized)
+
+            cleaned_lines.append(cleaned_line)
 
         result = '\n'.join(cleaned_lines)
 
@@ -463,7 +520,12 @@ class KeywordStripper:
 
         return result
 
-    def clean_subtitle_blocks(self, blocks: List[dict]) -> List[dict]:
+    def clean_subtitle_blocks(
+        self,
+        blocks: List[dict],
+        remove_watermarks: bool = True,
+        remove_garbage: bool = False,
+    ) -> List[dict]:
         """
         Clean a list of subtitle blocks, removing ads and watermarks.
 
@@ -485,13 +547,17 @@ class KeywordStripper:
             text = block.get("text", "")
 
             # Check if entire block should be removed
-            if self.should_remove_subtitle_block(text):
+            if remove_watermarks and self.should_remove_subtitle_block(text):
                 removed_count += 1
                 logger.debug("Removing ad block: '%s'", text[:50])
                 continue
 
             # Clean the text
-            cleaned_text = self.clean_subtitle_text(text)
+            cleaned_text = self._clean_subtitle_text(
+                text,
+                remove_watermarks=remove_watermarks,
+                remove_garbage=remove_garbage,
+            )
 
             # Skip if cleaning resulted in empty text
             if not cleaned_text.strip():
@@ -526,6 +592,27 @@ class KeywordStripper:
                 detected.append(keyword)
         return detected
 
+    def detect_garbage_labels(self, block_texts: List[str]) -> List[str]:
+        """Detect OCR/garbage patterns in subtitle blocks."""
+        labels = set()
+        for text in block_texts:
+            lines = text.split("\n")
+            seen = set()
+            for line in lines:
+                if self._is_music_line(line):
+                    labels.add("Music-only lines")
+                if self._is_timecode_line(line):
+                    labels.add("OCR timecodes")
+                normalized = self._normalize_line(line)
+                if normalized:
+                    if normalized in seen:
+                        labels.add("Duplicate lines")
+                    else:
+                        seen.add(normalized)
+            if len(labels) >= 3:
+                break
+        return sorted(labels)
+
     def set_force_remove_keywords(self, keywords: List[str]) -> None:
         """Set custom force-remove keywords and refresh regex cache."""
         type(self)._custom_force_remove_keywords = [
@@ -556,9 +643,17 @@ def clean_filename(filename: str, preserve_year: bool = True) -> dict:
     return get_stripper().clean_filename(filename, preserve_year)
 
 
-def clean_subtitle_content(text: str) -> str:
-    """Clean watermarks and ads from subtitle text."""
-    return get_stripper().clean_subtitle_text(text)
+def clean_subtitle_content(
+    text: str,
+    remove_watermarks: bool = True,
+    remove_garbage: bool = False,
+) -> str:
+    """Clean watermarks/ads and optional OCR garbage from subtitle text."""
+    return get_stripper().clean_subtitle_text_with_options(
+        text,
+        remove_watermarks=remove_watermarks,
+        remove_garbage=remove_garbage,
+    )
 
 
 def should_remove_subtitle(text: str) -> bool:
diff --git a/server/core/subtitle_processor.py b/server/core/subtitle_processor.py
index b760588..6e48f68 100644
--- a/server/core/subtitle_processor.py
+++ b/server/core/subtitle_processor.py
@@ -1267,6 +1267,7 @@ class SubtitleProcessor:
         format_options: SubtitleFormatOptions = None,
         strip_keywords: bool = True,
         clean_subtitle_content: bool = True,
+        clean_subtitle_garbage: bool = False,
         insertion_position: str = "start",
         preferred_source: str | None = None,
         language: str | None = None,
@@ -1294,6 +1295,8 @@ class SubtitleProcessor:
                           IMPORTANT: This ONLY affects the title lookup, NOT the subtitle content or timing.
             clean_subtitle_content: If True, remove embedded ads/watermarks (YTS, RARBG, etc.)
                           from inside subtitle text. This cleans the actual dialogue content.
+            clean_subtitle_garbage: If True, remove OCR garbage like timecodes, music-only
+                          lines, and duplicate lines inside a subtitle block.
         """
         file_path = Path(file_path)
 
@@ -1375,6 +1378,7 @@ class SubtitleProcessor:
                 subs = parse_srt(original)
                 stripper = get_stripper()
                 detected_keywords = stripper.detect_subtitle_watermarks(original)
+                detected_keywords += stripper.detect_garbage_labels([b.text for b in subs])
 
                 if not subs:
                     return self._fail("No valid subtitle blocks found")
@@ -1395,7 +1399,7 @@ class SubtitleProcessor:
                 # This removes things like "YTS", "RARBG", "OpenSubtitles" etc.
                 # from inside the actual subtitle text
                 # ─────────────────────────────────────────────────────────────
-                if clean_subtitle_content:
+                if clean_subtitle_content or clean_subtitle_garbage:
                     stripper = get_stripper()
                     original_count = len(clean_subs)
 
@@ -1406,7 +1410,11 @@ class SubtitleProcessor:
                     ]
 
                     # Clean the content
-                    cleaned_dicts = stripper.clean_subtitle_blocks(blocks_as_dicts)
+                    cleaned_dicts = stripper.clean_subtitle_blocks(
+                        blocks_as_dicts,
+                        remove_watermarks=clean_subtitle_content,
+                        remove_garbage=clean_subtitle_garbage,
+                    )
 
                     # Convert back to SubtitleBlock
                     clean_subs = [
@@ -1414,10 +1422,10 @@ class SubtitleProcessor:
                         for d in cleaned_dicts
                     ]
 
-                    removed_ads = original_count - len(clean_subs)
-                    if removed_ads > 0:
+                    removed_blocks = original_count - len(clean_subs)
+                    if removed_blocks > 0:
                         logger.info(
-                            f"Removed {removed_ads} ad/watermark subtitle blocks from {file_path.name}"
+                            f"Removed {removed_blocks} cleaned subtitle blocks from {file_path.name}"
                         )
 
                     if not clean_subs:
@@ -1546,6 +1554,7 @@ class SubtitleProcessor:
         self,
         file_path: str | Path,
         clean_subtitle_content: bool = True,
+        clean_subtitle_garbage: bool = False,
     ) -> dict:
         """Clean ad/watermark content from a subtitle file without inserting plots."""
         file_path = Path(file_path)
@@ -1557,6 +1566,7 @@ class SubtitleProcessor:
             return self._fail("Subtitle file too large")
 
         try:
+            stripper = get_stripper()
             with file_lock(file_path, timeout=30.0):
                 original = file_path.read_text(encoding="utf-8", errors="ignore")
                 subs = parse_srt(original)
@@ -1565,40 +1575,16 @@ class SubtitleProcessor:
                     return self._fail("No valid subtitle blocks found")
 
                 original_blocks = subs
-                removed_count = 0
-                modified_count = 0
+                detected_keywords = stripper.detect_subtitle_watermarks(original)
+                detected_keywords += stripper.detect_garbage_labels(
+                    [b.text for b in original_blocks]
+                )
 
-                if clean_subtitle_content:
-                    cleaned_blocks: List[SubtitleBlock] = []
-
-                    for block in original_blocks:
-                        text = block.text
-                        if stripper.should_remove_subtitle_block(text):
-                            removed_count += 1
-                            continue
-
-                        cleaned_text = stripper.clean_subtitle_text(text)
-                        if not cleaned_text.strip():
-                            removed_count += 1
-                            continue
-
-                        if cleaned_text != text:
-                            modified_count += 1
-
-                        cleaned_blocks.append(
-                            SubtitleBlock(
-                                block.index,
-                                block.start_time,
-                                block.end_time,
-                                cleaned_text,
-                            )
-                        )
-                else:
-                    cleaned_blocks = list(original_blocks)
-
-                sanitized = sanitize_all_blocks(cleaned_blocks)
-                if len(sanitized) < len(cleaned_blocks):
-                    removed_count += len(cleaned_blocks) - len(sanitized)
+                sanitized, removed_count, modified_count = self._clean_blocks_for_content(
+                    original_blocks,
+                    clean_subtitle_content=clean_subtitle_content,
+                    clean_subtitle_garbage=clean_subtitle_garbage,
+                )
 
                 if not sanitized:
                     return self._fail("No dialogue subtitles found after cleaning")
@@ -1634,8 +1620,8 @@ class SubtitleProcessor:
                 tmp.replace(file_path)
 
                 summary = (
-                    f"Removed {removed_count} ad blocks, modified {modified_count} blocks"
-                    if clean_subtitle_content
+                    f"Removed {removed_count} blocks, modified {modified_count} blocks"
+                    if (clean_subtitle_content or clean_subtitle_garbage)
                     else "Cleaned subtitle content"
                 )
 
@@ -1652,6 +1638,133 @@ class SubtitleProcessor:
             logger.error(f"Could not acquire lock for {file_path.name}: {e}")
             return self._fail(f"File is being processed by another task: {e}")
 
+    def preview_clean_file(
+        self,
+        file_path: str | Path,
+        clean_subtitle_content: bool = True,
+        clean_subtitle_garbage: bool = False,
+        max_changes: int = 80,
+    ) -> dict:
+        """Preview cleaning changes without modifying the file."""
+        file_path = Path(file_path)
+
+        if not file_path.exists():
+            return self._fail("File not found")
+
+        if file_path.stat().st_size > self.MAX_SRT_BYTES:
+            return self._fail("Subtitle file too large")
+
+        try:
+            with file_lock(file_path, timeout=10.0):
+                original = file_path.read_text(encoding="utf-8", errors="ignore")
+                subs = parse_srt(original)
+
+                if not subs:
+                    return self._fail("No valid subtitle blocks found")
+
+                sanitized, removed_count, modified_count = self._clean_blocks_for_content(
+                    subs,
+                    clean_subtitle_content=clean_subtitle_content,
+                    clean_subtitle_garbage=clean_subtitle_garbage,
+                )
+
+                cleaned_map = {}
+                for block in sanitized:
+                    key = (block.start_time, block.end_time)
+                    cleaned_map.setdefault(key, []).append(block)
+
+                changes = []
+                for block in subs:
+                    key = (block.start_time, block.end_time)
+                    updated = None
+                    if key in cleaned_map and cleaned_map[key]:
+                        updated = cleaned_map[key].pop(0)
+
+                    if updated is None:
+                        changes.append({
+                            "type": "removed",
+                            "start_ms": block.start_time,
+                            "end_ms": block.end_time,
+                            "timecode": f"{_ms_to_timecode(block.start_time)} → {_ms_to_timecode(block.end_time)}",
+                            "before": block.text,
+                            "after": "",
+                        })
+                    elif updated.text != block.text:
+                        changes.append({
+                            "type": "modified",
+                            "start_ms": block.start_time,
+                            "end_ms": block.end_time,
+                            "timecode": f"{_ms_to_timecode(block.start_time)} → {_ms_to_timecode(block.end_time)}",
+                            "before": block.text,
+                            "after": updated.text,
+                        })
+
+                    if len(changes) >= max_changes:
+                        break
+
+                return {
+                    "success": True,
+                    "summary": f"Removed {removed_count} blocks, modified {modified_count} blocks",
+                    "removed_blocks": removed_count,
+                    "modified_blocks": modified_count,
+                    "total_changed_blocks": removed_count + modified_count,
+                    "changes_truncated": (removed_count + modified_count) > len(changes),
+                    "changes": changes,
+                }
+
+        except FileLockError as e:
+            logger.error(f"Could not acquire lock for {file_path.name}: {e}")
+            return self._fail(f"File is being processed by another task: {e}")
+
+    def _clean_blocks_for_content(
+        self,
+        original_blocks: List[SubtitleBlock],
+        clean_subtitle_content: bool,
+        clean_subtitle_garbage: bool,
+    ) -> tuple[List[SubtitleBlock], int, int]:
+        stripper = get_stripper()
+        cleaned_blocks: List[SubtitleBlock] = []
+        removed_count = 0
+        modified_count = 0
+
+        for block in original_blocks:
+            text = block.text
+
+            if clean_subtitle_content and stripper.should_remove_subtitle_block(text):
+                removed_count += 1
+                continue
+
+            if clean_subtitle_content or clean_subtitle_garbage:
+                cleaned_text = stripper.clean_subtitle_text_with_options(
+                    text,
+                    remove_watermarks=clean_subtitle_content,
+                    remove_garbage=clean_subtitle_garbage,
+                )
+            else:
+                cleaned_text = text
+
+            if not cleaned_text.strip():
+                removed_count += 1
+                continue
+
+            if cleaned_text != text:
+                modified_count += 1
+
+            cleaned_blocks.append(
+                SubtitleBlock(
+                    block.index,
+                    block.start_time,
+                    block.end_time,
+                    cleaned_text,
+                )
+            )
+
+        sanitized = sanitize_all_blocks(cleaned_blocks)
+        if len(sanitized) < len(cleaned_blocks):
+            removed_count += len(cleaned_blocks) - len(sanitized)
+
+        return sanitized, removed_count, modified_count
+
     # ========================================================
     # Metadata fetching
     # ========================================================