Okay, this stuff is AMAZING! DIY shower cleaner -- vinegar and dish detergent. Don't worry about the brand or color. We used clear store brand detergent and it was GREAT! NO SCRUBBING required. As long as you can tolerate the smell :)
TUB SCRUB - Add one teaspoon of liquid soap and several drops of an antibacterial essential oil (such as tea tree, eucalyptus, rosemary, or peppermint) to one cup of baking soda. Add just enough water to form a paste, and use it with a sponge or brush to scour bathtub surfaces.