Unplug the toaster and let it cool down before cleaning. Start with the crumb tray. Take it out and empty it into your trash can before washing it with warm soapy water. While the tray dries, use a soft brush to loosen any remaining crumbs. Never put your toaster in the dishwasher, immerse it in water, or use detergents to clean the interior. Simply wipe down the exterior with a clean, damp microfiber cloth.