Okay, here are my $0.02 FWIW.
I used A2Z for several months last year on both my car and the parents` because the wheels on both of them are a PITA to clean. In that time both sets of vehicles had some pre-existing damage on at least one of the wheels (corrosion, paint problems, etc). During that time when I used A2Z on them I did not notice the problems becoming any worse than they already were.
Since then I`ve been experiementing with some "other" wheel cleaners, some acidic, some not, and the "good" wheels are still good, and the damaged wheels... well, they`re about right for going through a winter.
Incomplete rinsing maybe? :nixweiss
EDIT: A2Z does seem to be stronger than anything else out there - it can clean out my tire brush (white) while other cleaners can`t. I just haven`t seen it damage anything though...
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