Best way to use purple power?

I spray it on, agitate with a brush and then blast it off at the neighborhood car wash (da hood, not da prissy suburb). Mostly use to take off the worst crud on stuff that's too big to fit into my dunk bucket which is a 5-gallon plastic bucket with 3 gallons of water and 2# of lye. Both are sodium hydroxide based cleaners so they will attack/remove paint and or aluminum. I use stoddard solvent in my HF parts washer.