BMW Dakota Oyster - brown belt marks (~6 months old)

[Wolfy]

Hello, i discovered a few weeks back some brown marks on my driver's seat. Tried to clean them using the BMW Leather Foam cleaner and Leatherique Pristine Clean with no success, multiple times; also tried with some alcohol, probably rubbed too hard and I feel the upper layer on some very small areas may have been affected.

I need advice for (1) remove stains (2) repair outer layer (if necessary) and (3) protect with matte finish.

This is the driver's seat, marks are inside the red area



Here is a closer view:



This is the left side of the image, enlarged. This is where I believe the outer protective layer is damaged.



When I rubbed the belt, from which I think I got the color transfer from, with alcohol this is what i got:


Many thanks for your help!