Hi welcome along, As Andy said, give it a blow out. Mine did the same not so long back, I got one of them cannisters of compressed air and blasted it...all fine now :D
As were all on BMWOC I guess were all car nuts and we are on some kind of project or have done one in the past. Post your pics and a write up here, even if its not a BMW...:D
Have you used etch Andy.. Our usual process.... Wipe downPrep (320g)WipedownEtchPrimer2k top coatAnything will stick to etch and etch will stick to anything....!Removed! stinks though
Firstly forget the caliper covers, if you want blue calipers take them off an prep and paint them they will look tons better. If you go ahead with all this i'd use an M3 as a target.. In my opinion, any aftermarket stuff on BM's looks tacky.