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cleaning coal soot and old metal "siding"

rob333 (zone 7b)
5 years ago

I'm considering using TSP to clean both my 1926 coal run (not to be used, only for looks) fireplace and my porch ceiling. It's made of aluminium? Some metal. Anyone else done something like this? I know to have the solution really diluted, use a soft brush (no scrubbing), reapply two or three times, and rinse really well. Is there a better idea?

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