Use a paste of baking soda and water to safely remove baked-on grease from any toaster oven, including those made of aluminum. Depending on the type of toaster, chemical products such as Grease Lighting, Comet, Dawn Power Dissolver and Carbon Kleen may also effectively remove grease, according to HowToCleanStuff.net.
Unplug the toaster oven before beginning. Remove the racks, and let them soak in warm, soapy water. Choose your cleaning tool carefully based on the interior of your toaster oven, advises Martha Stewart. While steel wool is appropriate for a bare metal interior, avoid scratching a porcelain surface by using a gentle nylon pad. A green scrubbing pad is a reliable option for most toaster ovens, says HowToCleanStuff.net.
In a small bowl, mix water with baking soda or cream of tartar. Make a paste a little thicker than toothpaste. Spread the paste evenly on the greasy areas inside the toaster oven. Let it sit for a few minutes on especially greasy spots, then begin scrubbing. Apply more paste as needed, as well as lots of elbow grease for stubborn stains. Finish the job by rinsing the interior of the oven with warm, soapy water. Make sure it is completely dry before the next use.