I've been seeing this all over the MB, Just in case no one knows how to clean there mats. The first thing I do is clean it with Generic Alcohol with a washcloth. Let that dry for about 5 mins. Then tape all the way around the edges with masking tape very cheap one. Make sure to get where your roller bars goes over mat on the cricut. I do mine right up to the line where you put your cardstock onto the mat. Then I take the mat to my sunporch well vented area. Then I spray it with this Krylon make sure to spray evenly and waite for about an hour or two then TA DA very sticky again.