I used the Lift Off Spray Foam & Silicone Caulk Remover and it bleached my taupe gray tub. What happened?

Most bathtubs today are made up of fiberglass, which is very porous and can easily be discolored. For this reason, we do not recommend using Lift Off Spray Foam & Silicone Caulk Remover on fiberglass, acrylic, and plastic tubs/showers.