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OK Car mavens, exhaust your many resources.

Can anyone tell me why the leather seats in my 2009 Corvette and 2012 BMW are turning yellow (on the driver seat back by the left shoulder blade)???

BMW and Chevrolet have never seen this. It is from when I drive as I am the sole driver of the Corvette.

The leather in the Corvette is Tan and in the BMW gray.

Can't be sunblock as I do not put on my back plus I wear a shirt. If it were sweat or brand of soap why not on the right side also?

Thanks, have no clue what to do!!!

 

[JOSE'S 79]

both cars in the same spot? something rubbing up against it and dye is rubbing off or chemical reaction to what ever is rubbing on it?

 

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your cologne or deodorant or sweat is discoloring it