Stain on light grey leather
 

I valet my car in the city and when I got it back there was a black stain on the leather. I used an interior cleaner I had to clean it but I don't want to mess up the leather by applying to much pressure is there anything you guys can recommend to clean this....it's not as bad as it was before I tried to clean it but there a stain there. Also I know it takes away the beauty but I'm going to be Valeting for the next six months can you guys recommend any seat covers? Just want to prevent any further stains.