Cleaning a countertop microwave oven is relatively easy. Start by unplugging the oven and removing any removable parts such as glass turntable, racks, or filters. Wash these parts with warm soapy water or follow the manufacturer's instructions.nnFor the interior of the oven, prepare a solution of water and mild detergent. Wipe the interior with a soft cloth or sponge, paying attention to any stains or spills. Avoid using abrasive cleaners or scrubbing pads that may damage the surface.nnAfter cleaning, rinse and dry all the parts thoroughly before reassembling the oven.