1 lb. Granular Formula - Removes brown stains, dirt, grime on boat bottoms, exterior wood, aluminum siding, shingles, shutters, cement, stucco and pool decks. This formula is easy to mix use and contains no harmful abrasives or phosphates. The granular formula can be swabbed onto surface to be cleaned or sprayed on with an acid proof sprayer. Allow to sit and react for 10 - 15 minutes and then pressure wash off.