Grease is a stubborn substance. It clings to whatever surface it happens to come in contact with and refuses to let go. A toaster oven pan is designed specifically to take such abuse, so it can protect the toaster oven, but cleaning the pan can be a much-dreaded chore. It's not as bad as one may think. With a little time and effort, cleaning a toaster oven pan can be a short-lived chore.
Fill the sink with hot, soapy water. Use a dish soap that is good for cutting grease, such as Dawn.
Add 2 cups of vinegar to the water.
Place the oven pan in the water, making sure it is completely submerged.
Allow the pan to soak until the water is cool enough to touch.
Scrub the pan with a sponge or clean cloth. The grease should come off quite easily.
Wash the pan in warm, soapy water and rinse well with clear water.
Dry the pan with a dry, clean cloth.