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How to clean these dirty spots on Merino leather?
Hello, when I got my car 5 months ago, I covered all seats with leather shield. The "butt" area cleans great, but the "back" section has these dark spots that I can't get rid of no matter what I do. I tried to use gyeon leather cleaner and BMW leather cleaner. I'm not sure what else to try. I even wondered if I had forgotten to put a leather shield on the back of the seats.
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