Notice they did not test any of the products! A much cheaper product is Dawn dish washing, and Simple green. I mix half and half together in a water hose sprayer. I spray a 4 ft by 4 ft section. Let sit in shade for about 5-7 minutes. Scrub with a 8" scrubbing brush you buy at Lowes. Attach to a pole. Work vigorously that section for about five to seven minutes. Rinse immediantly.
Notice they did not test any of the products! A much cheaper product is Dawn dish washing, and Simple green. I mix half and half together in a water hose sprayer. I spray a 4 ft by 4 ft section. Let sit in shade for about 5-7 minutes. Scrub with a 8" scrubbing brush you buy at Lowes. Attach to a pole. Work vigorously that section for about five to seven minutes. Rinse immediantly.
pro tec did not live up to what they claim i had to add detergent to it to clean my roof.