GacoWash is a concentrated cleaning solution for roof membranes and existing waterproof systems. It is specially formulated to remove tough dirt, pollen, mildew and fungus. GacoWash is ideal for use as a cleaning solution for aged asphalt, aged EPDM and TPO/CPA, built-up, cap sheet, composite, concrete, fiberglass, metal, modified bitumen, torchdown, most existing coatings and coated polyurethane foam.