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      10-14-2019, 09:50 PM   #14
E36graduatebmw
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Drives: F10 535i xDrive
Join Date: Oct 2019
Location: Massachusetts

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Looks like a chemical reaction to something that was only on headrest.....I bet someone had put their hand/dirty rag on the headrest at some point in time and contaminated the leather. Brake cleaner, solvent, caustic, bleach, peroxide, oxiclean...something is reacting with the leather treatment and burning the cellulose/leather.
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