Depending on the stain, there are a few ways to clean it off of our Coin Nitro Rolls. First, if the staining that you are experiencing is from tar or dirt from the street, then you can easily use soap and water and some elbow grease or Purple Power to clean the flooring. If the staining if from your tires exclusively, this is a little bit tricky as there is no way to clean this. The only solution would be to either change out your mat to a Black mat or to place one of Auto Floor Guards floor protectors in the area where you park. This staining doesn't happen with every tire type, just with performance tires. If you need further assistance with trying to resolve your staining issues, please feel free to reach out to one of our Flooring Heroes either by phone, chat, or email.