diff --git a/bin/trans-clean.py b/bin/trans-clean.py
new file mode 100644
index 0000000000..e46b138763
--- /dev/null
+++ b/bin/trans-clean.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+"""
+Remove old translation keys (i.e. ones without matching source keys)
+from `translation/dest/*` to avoid failing trans lints until
+the next crowdin pull.
+"""
+
+import sys
+import pathlib
+import xml.etree.ElementTree as ET
+
+
+def clean(path):
+    db = path.parent.name  # site, study, ...
+    source = ET.parse(path.parent.parent.parent / "source" / f"{db}.xml").getroot()
+    tree = ET.parse(path)
+    root = tree.getroot()
+    change = False
+
+    for el in list(root):
+        name = el.attrib["name"]
+        source_el = source.find(f".//{el.tag}[@name='{name}']")
+        if source_el is None:
+            root.remove(el)
+            change = True
+    
+    if change:
+        if root:
+            last = root[-1]
+            last.tail = last.tail.rstrip(" ")
+
+        with open(path, "wb") as f:
+            f.write(b'<?xml version="1.0" encoding="utf-8"?>\n')
+            tree.write(f, xml_declaration=False, encoding="utf-8", short_empty_elements=False)
+            f.write(b"\n")
+        
+    return change
+
+
+if __name__ == "__main__":
+    args = sys.argv[1:]
+    if args:
+        changed = sum(clean(pathlib.Path(arg)) for arg in sys.argv[1:])
+        print("Changed", changed, "files")
+    else:
+        print(f"Usage: {sys.argv[0]} translation/dest/*/*.xml")