I started doing this and will never stop! My tub & shower are always spotless-so simple. Simple shower and tub cleaner: fill wand half and half. Wet surface and scrub. wow! leave in shower & wash while you are already in there.
The Craft Patch: Pinterest Tested: Tub Cleaner (She uses 1/2 vinegar, 1/2 Dawn dish washing liquid solution and loved it. She also mentions that there is a "cleaning grade vinegar" at Walmart for jobs like this. )