For those who kasher plastic. (Those who do not kasher plastic should put away their microwave for Pesach.)
- Clean thoroughly and do not use for 24 hours.
- Remove the glass turntable and replace it with a new, kosher-for-Passover surface.
- After 24 hours, fill a styrofoam cup with water and boil it in the microwave for 10 minutes.
- Refill the cup and move it to another spot. Boil it in the microwave for 10 more minutes.
- Tape cardboard or contact paper over the interior glass window pane for the duration of Passover.
