Too many variables to give a definitive answer to that one. Based on what I read on the manufacturers web site, that coating should have withstood the cleaning compound. Not knowing what was actually used and doing some tests to try and repeat the corrosion experienced your only safe bet is to use mild soap and water and never use any kind of spray chemical cleaner on after market brakes like that.
2013 335is Vert Black on Black DCT
2008 - Z4MR - Sold
BMWCCA / ZSCCA Member