Tips and Tricks For best results, use a dry iron when pressing. When pressing an embroidered block, iron on the wrong side. The wool mat will cushion the stitches and retain the texture of the embroidery design. If the mat feels damp after use, hang to air-dry before storing. Wash the mat occasionally by rinsing it in cold water and hang the mat until dry. If you choose to use starch, wait to press the fabric until it is completely dry. . Starch build-up can scorch the mat if not cleaned properly. Recommended surfaces for the wool mat include Formica, Corian, stone, and metal (an ironing board). Wood and painted surfaces should be avoided. Never place the mat on a rotary cutting mat when pressing. The heat could warp the cutting mat.