You can clean your blades while they're on the saw, but if you do make sure to disconnect the power. An easier method is to clean the blade when you're removing them to have them sharpened. The buildup can be removed using a furniture-cleaner known as buildup remover. Apply the cleaner directly onto the blade, and use an old toothbrush to scrub away the buildup. For stubborn buildup, follow up with some cleaner and fine steel-wool.