Hello I hope someone can help me. I have a BMW 320 E90 with grey leather seats (Montana-Grey). The previous owner had deposited 2 of the 4 winter bikes on the back bench over a long period of time. This resulted in clearly recognizable BRAUNE prints or discoloration. I have now distributed the profile pattern and the inscription of the tyres on my seats! I have tried it so far with leather care, vinegar water, industry cleaner & Sonax stain & adhesive remover. I have not even got a bit clean with any of the mentioned means. How do such prints arise and how can I get them away from them?! I am grateful for any answer. mfg iLLmat