Directly after use, gently scrub the mat with warm water and a bit of dish soap. Be sure not to scrub with anything too abrasive, as it can easily scrape off the silicone coating. The gentle side of a normal dish sponge should do the trick. This will clean the mat 99% of the time, since silicone is so good at being nonstick. If water and soap do not work, get some baking soda and rub it on the residual water still on the mat. The result should be a baking soda paste. Leave the paste on the mat for 20 minutes, making sure it’s concentrated on the dirtiest spots. After those 20 minutes, rinse the paste off with hot water – boiling hot, if possible. This method should remove anything stuck to the mat, although it will not get rid of any discoloration.