Best on the market for shower, tub, and toilet bowl Removes soap scum, rust, hard water deposits and lime This bottle is concentrated, just fill spray bottle with 4 parts water (4/5 or 80% water) 1 Gallon in size NOTE: Do not place container on formica, or any other porous surfaces. For very old surfaces being cleaned, test a small, inconspicuous area to determine if glaze or enamel surface is removed. If so, discontinue use immediately.