How do you clean tough stains out of silicone bakeware?

One method is to use hot water and a few drops of dish soap. Make sure the mixture is very sudsy and very hot to be most effective. Submerge the silicone bakeware in the mixture for 45-60 minutes, depending on how deeply stained it is. Afterwards, scrub the bakeware with a non-abrasive cloth or sponge. Rinse the bakeware with water and repeat the steps if necessary. Another method is heating up the bakeware until it is very hot and using a paste-mixture of baking soda and hot water to scrub the silicone bakeware with a non-abrasive sponge. Rinse and repeat as necessary.