rentzington

So I got a used c63 a month or so ago and it felt like the dealer had wiped all the seats with armor all they were super slick.

So tonight I go out and finally try to clean them and just started with a microfiber with warm water and I rub down the back seats no issue start on the driver side and I start to notice black everywhere i am rubbing ....sure enough looks like color is coming up ...the interior is camel or sand, not sure what they call it

Any ideas on what causes this and how to fix it? It's not too bad because I stopped trying to clean it but it's going to be stuck in my ocd brain