Dawn + Vinegar + 1 Bottle=Magic in a Bottle! THIS REALLY WORKS. Some posts say to heat the vinegar, but I use the spray cold and it works great. Spray your tub/shower the night before you are going to clean it. The next day, I usually wipe it with an old shower scrubbie, but there is no need to scrub. Give it a hot rinse and everything will be clean and shining.