Hi -
Brand new member, lurking, but couldn't help but post on this -
I had a similar problem on my champagne colored BMW seat, and I couldn't figure out what the problem was - a "hip" area stain!
I tried changing my coat, my jeans, EVERYTHING!!!!
I could NOT figure out what the stain was coming from.
I even had to recolor my seats, because it WAS NOT COMING OFF.
I tried every product I could, it would not come off. SO, as i mentioned, I had to recolor my seats, with a leather dye I found online.
It came out great!
Until the stain started again.
I could not believe it - different jacket, different pants - towels on the seats..what was it!!!????
Until it hit me. MY BELT.
My thick black leather belt, the type you wear with jeans, was making the stain!! That explains the hip area!!!
It may be your belt! Needless to say, I threw that belt out, and the stains stopped. It was only that belt.
Give that a look - it was the culprit that ruined my seats -
Anyway, wow, what a first post!
Jerry