diff --git a/README.md b/README.md
index 8e5de5e..12d07db 100644
--- a/README.md
+++ b/README.md
@@ -57,6 +57,8 @@ Once installed, you can use the tool by following these steps:
    ```
 3. The tool will process the YAML file and organize your music according to the specified configuration (see below).
 
+Check out `tonuino-cards-manager --help` for all available options.
+
 ### Demo
 
 [![asciicast](https://asciinema.org/a/663963.svg)](https://asciinema.org/a/663963)
diff --git a/tonuino_cards_manager/_clean.py b/tonuino_cards_manager/_clean.py
new file mode 100644
index 0000000..bd911d5
--- /dev/null
+++ b/tonuino_cards_manager/_clean.py
@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: 2024 Max Mehl <https://mehl.mx>
+#
+# SPDX-License-Identifier: GPL-3.0-only
+
+"""Helper functions for file operations"""
+
+import logging
+from pathlib import Path
+from shutil import rmtree
+
+from ._card import Card
+from ._helpers import get_directories_in_directory, proper_dirname
+
+
+def clean_unconfigured_dirs(destination: str, cards: dict[int, Card]):
+    """Delete directories that are not configured as cards"""
+    dest = Path(destination)
+    # Calculate which directories are handled by the configuration
+    handled_dirs = [proper_dirname(card) for card in cards]
+    # For each existing directory on the SD card, check whether it is concerned
+    # by the configuration
+    for dirpath in get_directories_in_directory(dest):
+        if dirpath.name in ("mp3", "advert"):
+            continue
+        if dirpath.name not in handled_dirs:
+            logging.info(
+                "The directory %s exists on the SD card although it is not configured here. "
+                "Deleting it because you requested it with --force",
+                dirpath.name,
+            )
+            rmtree(dirpath)
diff --git a/tonuino_cards_manager/_helpers.py b/tonuino_cards_manager/_helpers.py
index 781e14d..80d62ea 100644
--- a/tonuino_cards_manager/_helpers.py
+++ b/tonuino_cards_manager/_helpers.py
@@ -53,3 +53,8 @@ def decimal_to_hex(number: int | str) -> str:
 def get_files_in_directory(directory: Path) -> list[Path]:
     """Get all files in a directory, sorted"""
     return sorted([f for f in directory.iterdir() if f.is_file()])
+
+
+def get_directories_in_directory(directory: Path) -> list[Path]:
+    """Get all directories in a directory, sorted"""
+    return sorted([f for f in directory.iterdir() if f.is_dir()])
diff --git a/tonuino_cards_manager/main.py b/tonuino_cards_manager/main.py
index cc56a5e..83c6afe 100644
--- a/tonuino_cards_manager/main.py
+++ b/tonuino_cards_manager/main.py
@@ -8,6 +8,7 @@
 import logging
 
 from . import __version__
+from ._clean import clean_unconfigured_dirs
 from ._config import parse_config
 from ._qrcode import generate_qr_codes
 
@@ -19,6 +20,12 @@
     required=True,
     help="The destination directory in which the data is written to",
 )
+parser.add_argument(
+    "-f",
+    "--force",
+    action="store_true",
+    help="Delete all song folders on the destination which are not configured by you",
+)
 parser.add_argument("-v", "--verbose", action="store_true", help="Verbose output")
 parser.add_argument("--version", action="version", version="%(prog)s " + __version__)
 
@@ -73,6 +80,10 @@ def main():
 
         qrdata.append(f"{card_bytecode};{card.create_carddesc(cardno)}")
 
+    # Delete directories that have not been configured
+    if args.force:
+        clean_unconfigured_dirs(args.destination, config.cards)
+
     # Create QR code
     generate_qr_codes(qrdata)