Have used about 3/4 cup dawn & about 1-1/4 vinegar for years. It really cleaned a gosh awful shower in our previous house. Well- we sold that house last year & I'm proud to say that the acrylic tub, while nearly 12 yrs. old, looked brand new. Couldn't believe what my usual cleaning mix was able to do for that tub!!! We too use a squeegee to 'wipe down' the shower after each use. No water spots!
sewverybusy1