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.

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