How to clean yellowed plastic?

Bleach

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It sneaks up on you. I thought my microwave was kept clean, inside and out. But I recently walked into the kitchen and saw that the microwave door was a total beige instead of white. Using bleach and baking soda made a pretty good paste after the odor settled some, and this lightened the door somewhat. I've been wanting to add more color to the kitchen. I think I'll paint the door a bright color, taping off the glass in the door and the hinges. The microwave was less than $100 over ten years ago. It is giving its life for me, but maybe a new wig wouldn't be a bad idea. Best wishes 😇

Depends on how long it has been yellow. If it is newer a magic eraser may work!

No bleach! It will ruin the structure of the plastic. Soak in hydrogen peroxid and sit in sunshine. Totally works!