Advice on gutter cleaning gone wrong

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Interesting. I wonder how it would work for:

Safest degreaser/deep cleaner for road-side painted houses?

Mike Hall posted this in another thread. Hoping this might work for what I want to do. Very reasonably priced. Shipping costs more than the chem, though… At any rate, I gotta figure out something soon. Have some apartment buildings to clean on July 3rd with paint in decent shape, but they’ve been absolutely hammered by road-grime.

Mary? @CaCO3Girl