Promising review: "We cannot BEGIN to tell you what a lifesaver this is! We have two old fiberglass tubs with vinyl shower enclosures that no matter what amount of scrubbing we have done with everything from bleach to cleanser to vinegar and baking soda would NOT come clean. After I took my shower last night, I sprayed down the tub and walls. Within minutes, all the built-up water deposits and dirt and grime began to melt away in front of my eyes. I left it on overnight, and when I got up this morning, it did not look like the same tub and shower. This product is a godsend, especially for old folks like us who have difficulty getting down on our hands and knees and scrubbing anything. More importantly, it performs as advertised. We plan on using it as part of our weekly cleanup routine, in addition to purchasing the Wet and Forget Mold and Mildew Remover for use on the vinyl siding of our house. This is truly an overnight sensation!" —Amazon Customer
"I tried everything under the sun to clean the bottom of the shower. This product was the only thing that worked. Have recommended to several people since I used it the first time." —Cassie lee
Get it from Amazon for $16.89.