Your fiberglass cleaner is superior to anything we have tried on our new acrylic tub. We even tried a product sold by American Standard for it acrylic tubs and it failed also. Your product is a lifesaver. After spending several thousand dollars to remodel a bathe you want to use a product gentle enough to clean the tub without harmful abrasives, or bleach, or caustic- all bad for acrylic surfaces. Yours is the best!