Stiles, I have to agree with Padre on this one. Ours has a bad case of acne, well beyond the freckles stage. A couple of months in one place with fall leaves and rain and me not checking the roof caused the stains. At this point I just clean the dirt off of it and forget trying to get it back to white. Someday I may try OxyClean but I doubt it will ever be snowy white like it once was.
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