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Tub or shower wall tile preparation: Apply a layer of 1/2â³ thick cement backer board to the wall studs. Tape any seams and corners with fiberglass tape. Apply thin-set adhesive over the fiberglass tape, and allow it to dry. Roll a waterproofing sealer over the walls, and allow the sealer to dry.
Scrub around the area that you've applied the abrasive powder to. 3. Clean very tough stains with a pumice stone. This is recommended for tougher stains when scrubbing. 1  Be sure your tub is porcelain when using a pumice stone.2  Acrylic and enamel bathtubs should NOT have pumice stone applied to them. 3  It will mar the surface with scratches. Enamel.This is common in older tubs and is very sensitive to drain cleaner and bleach. 2  Brown, rust-like stains instantly appear when the tub is exposed to bleach or a strong acid. 3  Acrylic.