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 or pour on surface, let it sit 1-2 hours. Used sponge but didn't take much scrubbing at all and then rinsed. I did it yesterday and worked perfectly!