If you aren't doing a lot of decks and don't want to buy a 50# bag of Sodium percarbonate. Wolman Deck Brightner is great. Just don't have your water to warm when you mix it in or it will foam up to much and waste a lot.
I;m pretty sure that stuff is Oxacid or mostly anyway. OA Works wonders for non resin producing woods like cedar and redwoods....
If you do more than just roof cleaning it is always good to keep some oxalic acid on hand.
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