Trolls Breath is quite weak compared to the likes of Bilt Hambers AutoWheel, so I wouldn't imagine it would of caused any damage. The worst you can do is let it dry, but even then you can reactivate it by wetting or reapplying. I would hazard a guess and say its tar. Get some tar remover and see if that shifts it.Good Morning.
I've recently acquired an ST3 MK8.5 which has these wheels on it;
View attachment 592905
I washed it for the first time at the weekend, so I snowfoamed, then sprayed the wheels with Trolls Breath iron out on the alloys.
I rinsed it off about 5 minutes later then continued with a contact wash, dry & quick detail.
When I came to dry off the wheels I noticed that one of them appears to have some residue on the surface. I tried to scrub it off with the back of a wash mitt (the bug remover side) but it seems to be ingrained onto the wheel.
I'm worrying now that these matt finish wheels dont like the trolls breath. Although it only seems to have happened to one of them. I didnt notice it before but I can't be sure it wasnt already there when we bought the car last week.
I'll try and get some pics of the damage when the wife gets home from work in it, but wanted to post in case anyone had seen the same.