Lots of baking will happen for the holidays very soon! If you use silicone baking mats, they can build up a sticky, and even stinky, residue. This residue can be difficult to remove.
One method to clean up silicone mats is to place the mat on a wire rack inside a rimmed baking sheet. Bake in a 450°F for about one hour, or until it stops smoking. Remove the mat with hot pads or tongs. Wash with soap and hot water. If residue is still present, use a non-abrasive scrub to remove the remaining residue. The baking will also help remove strong odors from the mat.
An alternative to silicone baking mats is parchment paper which can be used at baking temperatures up to 450°F and sometimes 500°F.
Source: Cook’s Illustrated website