"How can a window mat is all scuffed and dirty, how can I clean it" ?  This is a question we often get asked from Customers who do their own picture framing or assemble their picture frames and photo frames. New window mats (also called window mounts) shouldn't get to Customers dirty or scuffed but occasionally this does happen. If you do get this problem, you have the choice of going back to the mat supplier and asking for a mat replacement or try to fix .. the problem yourself. This post will not address the former solution but the latter. When a window mat or matboard bears scuff ...