
Used by hand on a porch that was extensively covered in mildew, mildew and oak pollen. I have cleaned the area 5 times with little improvement. In the end I stopped diluting it, turned it on full strength and let it sit for ten minutes. It brought a small improvement. Not worth the money and trouble. Here is my after photo. Not much different than at the beginning. You can see a clean area that is protected and not stained.

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