diff --git a/script/translations_clean.py b/script/translations_clean.py
new file mode 100644
index 00000000000000..d801ce0a308562
--- /dev/null
+++ b/script/translations_clean.py
@@ -0,0 +1,116 @@
+"""Find translation keys that are in Lokalise but no longer defined in source."""
+import json
+import pathlib
+import sys
+
+import requests
+
+INTEGRATION_DIR = pathlib.Path("homeassistant/components")
+PROJECT_ID = "130246255a974bd3b5e8a1.51616605"
+
+
+class Lokalise:
+    """Lokalise API."""
+
+    def __init__(self, project_id, token):
+        """Initialize Lokalise API."""
+        self.project_id = project_id
+        self.token = token
+
+    def request(self, method, path, data):
+        """Make a request to the Lokalise API."""
+        method = method.upper()
+        kwargs = {"headers": {"x-api-token": self.token}}
+        if method == "GET":
+            kwargs["params"] = data
+        else:
+            kwargs["json"] = data
+
+        req = requests.request(
+            method,
+            f"https://api.lokalise.com/api2/projects/{self.project_id}/{path}",
+            **kwargs,
+        )
+        req.raise_for_status()
+        return req.json()
+
+    def keys_list(self, params={}):
+        """Fetch key ID from a name.
+
+        https://app.lokalise.com/api2docs/curl/#transition-list-all-keys-get
+        """
+        return self.request("GET", "keys", params)["keys"]
+
+    def keys_delete_multiple(self, key_ids):
+        """Delete multiple keys.
+
+        https://app.lokalise.com/api2docs/curl/#transition-delete-multiple-keys-delete
+        """
+        return self.request("DELETE", "keys", {"keys": key_ids})
+
+
+def find_extra(base, translations, path_prefix, missing_keys):
+    """Find all keys that are in translations but not in base."""
+    for key, value in translations.items():
+        cur_path = f"{path_prefix}::{key}" if path_prefix else key
+
+        # Value is either a dict or a string
+        if isinstance(value, dict):
+            base_search = None if base is None else base.get(key)
+            find_extra(base_search, value, cur_path, missing_keys)
+
+        elif base is None or key not in base:
+            missing_keys.append(cur_path)
+
+
+def find():
+    """Find all missing keys."""
+    missing_keys = []
+
+    for int_dir in INTEGRATION_DIR.iterdir():
+        strings = int_dir / "strings.json"
+
+        if not strings.is_file():
+            continue
+
+        translations = int_dir / ".translations" / "en.json"
+
+        strings_json = json.loads(strings.read_text())
+        translations_json = json.loads(translations.read_text())
+
+        find_extra(
+            strings_json, translations_json, f"component::{int_dir.name}", missing_keys
+        )
+
+    return missing_keys
+
+
+def run():
+    """Clean translations."""
+    missing_keys = find()
+
+    if not missing_keys:
+        print("No missing translations!")
+        return 0
+
+    lokalise = Lokalise(PROJECT_ID, pathlib.Path(".lokalise_token").read_text().strip())
+
+    to_delete = []
+
+    for key in missing_keys:
+        print("Processing", key)
+        key_data = lokalise.keys_list({"filter_keys": key})
+        if len(key_data) != 1:
+            print(
+                f"Lookin up key in Lokalise returns {len(key_data)} results, expected 1"
+            )
+            continue
+        to_delete.append(key_data[0]["key_id"])
+
+    print("Deleting keys:", ", ".join(map(str, to_delete)))
+    print(lokalise.keys_delete_multiple(to_delete))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(run())