Hello together, during the installation of my Winter-Alus I noticed a strange damage to the valves after washing on all 4-wheels. Is there any explanation for this? The remaining sides of the rims look very good all around, only on the valves there are these problems. Could there also possibly have been something wrong with the tyre dealer during the assembly of the RDKS and thus the clear varnish first had been crushed and then the aluminium corrosion used (1.ter and 1. einz a tyre exchange was 2 years ago)? Would you be curious to hear your opinion and have put in some pictures once. Thank you