Unplug the microwave: Before you begin cleaning, unplug the microwave from the electrical outlet to ensure your safety.

1. Remove the grill: Locate the grill on the bottom of your microwave. Depending on the model of your microwave, the grill may be held in place by screws or clips. Use a screwdriver or a flathead tool to remove any screws, or use your fingers to gently push the clips down and remove the grill.

2. Clean the vents: Once you have removed the grill, you should have access to the vents. Use a soft-bristled brush or a vacuum cleaner with a brush attachment to gently remove any dust or debris from the vents. You can also use a damp cloth to wipe down the vents if necessary.

3. Clean the grill: While you have the grill removed, take the opportunity to clean it as well. Use a damp cloth or sponge to wipe down the grill, and then dry it off with a clean towel.

4. Reinstall the grill: Once the vents and grill are clean, reinstall the grill by reversing the steps you used to remove it. If your microwave uses screws to hold the grill in place, make sure to tighten the screws back up.

5. Plug in the microwave: Finally, plug the microwave back into the electrical outlet and test it to make sure it is working properly.

Cleaning the vents under your microwave is important for proper ventilation and to prevent overheating. I hope this helps! Let me know if you have any questions.