any advice @LostInBal ?Not really sure but that's what it looks like...seller didn't disclose the mark and when she was called on it she reduced the price so I took a chance....I've tried Leather CPR, Apple conditioner, rubbing with damp microfiber towel. Here's a pic
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My DH as experience dyeing vinyl upholstery and might be able to mix a color to lightly wash over a section of the bag but there is a risk it could be worse if he misses