diff --git a/data/external/main.py b/data/external/main.py
index a480a8192..717dd12dc 100644
--- a/data/external/main.py
+++ b/data/external/main.py
@@ -1,37 +1,56 @@
 import logging
 import os
+from pathlib import Path
 
 from external.scrapers import nat, public_transport, roomfinder, tumonline
 from external.scraping_utils import CACHE_PATH
 from utils import setup_logging
 
+
+def ensure_is_empty(directory: Path):
+    """
+    Make the specified directory empty by recursively deleting all its contents.
+
+    Args:
+    ----
+        directory: The directory path to be emptied.
+
+    Returns:
+    -------
+        None
+
+    """
+    for item in directory.iterdir():
+        if item.is_dir():
+            try:
+                os.removedirs(item)
+            except OSError:
+                ensure_is_empty(item)
+        else:
+            item.unlink()
+    directory.rmdir()
+    os.makedirs(CACHE_PATH, exist_ok=True)
+
+
 if __name__ == "__main__":
     setup_logging(level=logging.INFO)
-    # Create cache directory structure
-    os.makedirs(CACHE_PATH, exist_ok=True)
-    os.makedirs(CACHE_PATH / "filter", exist_ok=True)
-    os.makedirs(CACHE_PATH / "tumonline", exist_ok=True)
-    os.makedirs(CACHE_PATH / "nat", exist_ok=True)
-    os.makedirs(CACHE_PATH / "room", exist_ok=True)
-    os.makedirs(CACHE_PATH / "maps" / "roomfinder", exist_ok=True)
-    os.makedirs(CACHE_PATH / "maps" / "roomfinder" / "kmz", exist_ok=True)
-    os.makedirs(CACHE_PATH / "public_transport", exist_ok=True)
+    ensure_is_empty(CACHE_PATH)
 
-    # You can comment out steps that should be skipped.
-    # The downloader will automatically create a cache in `cache/`.
-    roomfinder.scrape_buildings()
     tumonline.scrape_buildings()
-    nat.scrape_buildings()
-
-    roomfinder.scrape_rooms()
     tumonline.scrape_rooms()
-    nat.scrape_rooms()
-
     tumonline.scrape_usages()
+    tumonline.scrape_orgs(lang="de")
+    tumonline.scrape_orgs(lang="en")
 
+    os.makedirs(CACHE_PATH / "nat", exist_ok=True)
+    nat.scrape_buildings()
+    nat.scrape_rooms()
+
+    os.makedirs(CACHE_PATH / "maps" / "roomfinder", exist_ok=True)
+    os.makedirs(CACHE_PATH / "maps" / "roomfinder" / "kmz", exist_ok=True)
+    roomfinder.scrape_buildings()
+    roomfinder.scrape_rooms()
     roomfinder.scrape_maps()
 
+    os.makedirs(CACHE_PATH / "public_transport", exist_ok=True)
     public_transport.scrape_stations()
-
-    tumonline.scrape_orgs(lang="de")
-    tumonline.scrape_orgs(lang="en")