Cleaning a microwave oven is relatively easy as little heat is generated on the interior surfaces, so there is less baking and setting of spills or spraying.
To clean the interiors, wipe the surface with a soft cloth and warm water.
Avoid using abrasives, harsh cleaners or scouring pads.
For tougher stains, use baking soda or a mild soap and rinse thoroughly with hot water.
As a precautionary measure, ensure that nothing falls inside the microwave oven.