Sandwich makers are a very popular item in many households, and just like other cookware, they need to be cleaned. Cleaning can be fairly easy, and with a few steps, can be done fairly quickly.
Open the sandwich maker. With a spatula, scrape off any stuck-on food on the top and bottom griddles, wiping away loose bits of food and excess grease with paper towels.
Plug in the sandwich maker for a couple of minutes or until moderately hot, then unplug. This will make things easier for the next step.
Grab a wet sponge and give the griddles a good scrub. The heat and water from the wet sponge creates a steam which will loosen stubborn food particles and grease. If the sponge gets too hot, use a pair of tongs or oven mitts to manoeuvre. Sandwich makers usually have a "non-stick" coating that keeps food from sticking onto the griddles and makes for easier cleanup.
With wet paper towels, wipe the griddles clean of water.
Let the sandwich maker air-dry for a few minutes, and close.