BIO-DEX PWB32 1 qt Bottle Plaster White 'N Brite Acid Wash 12 per case. Plaster White 'N Brite when used as directed eliminates acid fumes, thickens the acid/water solution for better "cling" to pool plaster without etching of the surface, leaving the plaster smooth and beautifully white. Colored surfaces are left clean and free of scale and stains. Plaster White 'N Brite is an acid wash additive that thickens acid for non-streaking application while eliminating fumes and etching problems associated with acid alone. It's an environmentally safer product that isn't corrosive, toxic or difficult to use. It is a great choice for acid washing that is user friendly and completely biodegradable. The product produces better results than acid alone.