Once again, we need to write to the manufacturer of products we use, when they don't live up to our expectations.
Fiskars sent me infomation on the same subject. Rolling the mat was one of the things they suggested. You can use an assortment of brushes, and nylon net scrubbers. Best of all, they said the mat is reversible, so you get twice as much cutting surface for your money. They are not cheap.
1gem said she let her blade get dull, and dull blades mean we push harder to get the fabric cut, and put more cuts into the mat. Blades can be bought on line at a much lower price. . One place does a replacement at a fair price. It is:
http://www.houseofhanson.com/lpsharp.html
I have purchased blades here and am ready for a 2nd round of blades. What they sent were NOT resharpened blades, but packaged OLFA blades, brand new.
I keep 3 cutters handy so when one starts skipping, I have a new blade in another cutter ready to "roll."