Weathered Membrane Cleaner is used to clean both new and in-service Sure-Seal®, Sure-Tough® and Sure-White® EPDM membranes and Sure-Weld® TPO membrane prior to the seaming process. It helps to loosen and remove dirt and other contaminants from the surface of the EPDM and TPO membranes and leaves a suitable surface for welding or the subsequent application of primer. It should be used when preparing EPDM membranes for application of adhesives, primer, Factory-Applied Tape™ (FAT), SecurTAPE™ and flashing.