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Maintain a clean kitchen.
The importance of maintaining a clean kitchen
Having and maintaining a clean kitchen is not a microwave-specific maintenance tip. However, insects and bugs do like to reside inside microwave ovens. For an insect, a warm power board is an ideal home. The cleaner your kitchen is, and the cleaner your microwave is, the less likely it is that insects will find their way into your microwave. See below for a link to cleaning your microwave oven.
CAUTION: Your microwave oven is capable of giving you a serious electrical shock, even when it is unplugged. We strongly suggest you seek the assistance of an appliance repair technician when conducting any microwave oven repair.