Need advice on cleaning oxidation off a metal roof to prep for repainting

Personally......I'd 2 step it but use a high ph soap as the second step. You'll see all the chalky paint turn bright again. I agree that it's probably not a good practice job for you though. If you don't do it right the paint won't stick then your buddy is mad at you and the painter!
What acid would you spray first before applying the caustic detergent?
 
Josh,

I could not find where you registered?

AC
I registered a few months back under the username "Josh Davis". I can log in, but can only access part of the forum. I remember getting a conformation email from you when I registered... Guess something went wrong.
 
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