Have used Wolman's Deck Cleaner/Brightner but a light green stain remains that I can not remove on some boards. Could this be mill glaze or possibly algae under a clear coat sealant? Any ideas or solutions? Thanks.
Like Craig said, it is most likely green fromt the pressure treating process. Some boards get it worse then others. If only certain boards are green, that is about the only thing it can be. Nothing at all that you can do about it. It probably has looked like that since the day it was built.
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Mike Hughes
Everclear
Souderton, PA