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Registered
Join Date: Jun 2007
Location: Lake Oswego, OR
Posts: 6,325
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Aluminum is unique in that it reacts to acid as well as base. Start mild and work your way up. If you remove the oxide layer, the aluminum could get an odd dark grey hue.
I would start with simple pressure washing. A mechanical removal sounds like it won’t work. So that leaves chemical. Go slow. Simple Green and Power Purple both can remove a little aluminum.
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