You don't have to buy new sanding belts or belt cleaners, Just find an old shoe and you will be back in business!
Step 1: Find an Old Shoe
Its as simple as going in your closet and finding an old shoe. If you lay your sander on its back then turn it on, get your shoe and sand away your gummed up sanding belt. This will provide you with a clean sanding belt and prevent you from spending tons of money on new sanding belts. You can also buy belt cleaners that do the same thing but i choose the shoe since it is free.