Clean your microwave inside and out. If it has a glass tray, the tray can be run through the dishwasher. You can use windex, a miracle spongegs or you can use a dish cloth and soapy water. Don’t obsess, just wipe it out and promise yourself that you will wipe up spills promptly in the future. If it is fairly well encrusted you may want to put a pyrex measuring cup 2/3 full of water in the microwave and run the microwave for about 5 minutes. The steam will soften the crud making it easier to wipe out. The water will be BOILING HOT so use extreme care when removing the measuring cup from the microwave.
Adding lemon juice to the water before boiling will add a very nice scent and sense of freshness
Don’t obsess, just do the tasks. Soap is generally soap and even shampoo can be used to cut the grease when you don’t have anything else. Always remember to make sure you rinse surfaces that will come into contact with food. Rinse means use clean, fresh water to get the soap off. Many stomach upsets are not from bad food but from soap that has not been rinse off our cooking utensils and counters that come into contact with food.