can't believe this works - I'll be using this again!!!! Tub Cleaner - vinegar and dish soap, no scrubbing! Heat 1/2C white vinegar in m'wave for 90 sec, pour int spray bottle. Add 1/2C BLUE Dawn dish soap. Shake gently to mix. Spray on surface, let it sit 1-2 hours. Just wipe it away then rinse with water. Should also take soap scum off shower doors!