diff --git a/clean-up-old-docker-images b/clean-up-old-docker-images
new file mode 100755
index 0000000..bb1a60e
--- /dev/null
+++ b/clean-up-old-docker-images
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# can add a -a, but it got rid of updated ubuntu images, I want to keep them
+# but ditch others... so need to let them accumulate again so I can work out a
+# better process / filter
+docker system prune -af