JohnAEC wrote:

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Thanks Jeff, but I'll pass on the acids & caustics etc for washing houses. Any product that can remove ALL the oxidation is going to damage the good paint underneath. The houses I wash are not vinyl or aluminium siding, they are water based acrylic paint on timber and maybe some oil based enamel on the timber window frames, plus leadlights, timber decks, sandstone patios & pool decks, extensions that don't need painting this time, sometimes even raw aluminium window & door frames. I'm not going to take chances on an up to $30,000+ paint job on a $1,000,000+ house. I did read somewhere that on of the US chemical suppliers (possibly Craig H) was working on a product to lift oxidation, but I'm not hopeful.

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 Ok John,..you do what suits your needs.  But the acids and caustics used properly will NOT harm any good paint,..water based or oil.  I've done it for years.  But  definitely stick your comfort level.

Jeff

Roof Soft Washing is the way to go

Roof Soft Washing on Long Island

I agree Art, softwashing a roof is the pros choice