There was a post about this yesterday or the day before. If you every month or so use warm sudsy water and a nylon scrungy and wash your mat it will last longer. Dip the scrungy, not the mat, wring it out and then go over your mat in a circular motion. Rinse and allow to dry flat. It will allow the self healing to work better and add life to your mat and your blades. You shouldn't "scrub" hard.