I have a self healing olfa cutting board. Olfa mentions, how these boards are renewed. I myself have put my board on a large towel on my dining room table. I use a squirt of dish detergent to some distilled water. I use a vegetable brush, those dish washing brushes also work. They are the ones you can put some dish detergent into. I use this combo, scrub lightly. I then rinsed in with distilled water. Used a sham wow and blotted it, let my board dry, then went over it with a quilters mat smoother. It really works. Board just like new. This can only be done on self healing mats