Biggest impact...get rid of the microwave! (it's a massive EMF emitter!) but for those who don’t want to toss it, let me teach you how to keep it clean!
1 cup white vinegar
2 cups hot water
15 drops Lemon oil (or any citrus)
1. Combine the ingredients in a glass spray bottle
2. Spray mixture inside the microwave, let sit and wipe clean using a damp cloth!
Seems simple enough! Are you cleaning your microwave today?