Anwkid
New member
We are currently working on some roofs on an apt complex that are giving me a lot of trouble. They are tile, pan and top, and they have not been cleaned in their 20 year life. Some are covered with heavy moss and lichen. I've used up to a 60% sh mix with gain and a sticky surfactant and it took literally hours to do a 2000 sqft area. The moss and mold go quick but the dried lichen like stuff sticks forever. I think I rinsed and reapplied 5 times waiting over 20 minutes each application. Any ideas?
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