I cleaned my winter tire rims and got a very good result with rim cleaner. Only 3 spots remained, at the rim under’m tank socket. At the spots I tried everything that came into my mind: Unfortunately nothing helped. Here is a picture of the ‘almost clean’ rim. Vlt. is the resinous diesel, I don’t know. The dirt layer is so thick that you can feel the transition. Do you still have a solvent ready with which I can knac this hard layer of dirt Otherwise, the rims have become very clean.