^^^ Wood deck brighteners are mostly that Phosphoric Acid and so are some of the rust treatments. Never seen then attack paints. Not a bad cleaner for aluminium but sure has to be neutralized well lest your parts turn a little black later on. May take a few days/weeks for the ambiant moisture in the air re-activating the residues in the pores and do that. Took a couple weeks on some of my parts.
KrudKutter????Had good results with that, the one that says "must for rust" does have a small concentration of Phosphoric in it. Sure cleans the rusty frame parts very well. Safe for Aluminium.