The best way to clean and maintain your microwave for optimum performance is to: 1. regularly wipe down the interior and exterior of the appliance with a damp cloth. 2. Additionally, you should also check the door seals for any signs of wear or damage, as this can affect the performance of your microwave. 3. It is also important to keep the vents free from dust and debris, as this can cause overheating. 4. Finally, it is recommended that you replace any worn-out parts such as fuses or control boards. This ensures that your microwave is working properly.