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What is the best technique to acid wash a trailer

I want to acid wash my trailer. I have done this in the past with headache racks and such but always ended up with streaks.

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Usually just to spray it on and come back right after and pressure wash off. If left on too long will turn your aluminum rails white.

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Dilute the acid with water, don't let it stay on too long. Wear a mask, he vapors will get ya.

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Sorry, I Know this is an old post, however I spray on the acid with a pump up sprayer. Start at the bottom, and work your way up, with even coverage. it should begin foaming right away. I usually do about a 4-5 foot square area, then wash it off, again, from the bottom up. I don't dilute it, and I don't let it dry before I wash it off. Also, a good spray wax will neutralize the acid and seal the pores in the aluminum when you're done.

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William will be eternally grateful.
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