Often the stuff in the microwaves is so baked on it’s difficult to just spray and wipe. To Soften this baked on food and to eliminate an odours follow these steps;
Spray the inside with your regular Spray & Wipe and leave. Place a Jug of Water with a slice of lemon inside the microwave and set the Microwave to 3-4 minutes. Once finished leave the Mug inside for a further 3 minutes while the steam and the spray and wipe now loosen and soften the backed on grime and the lemon eliminates most of the odours.
Now just use a soapy cloth to wipe down the inside of the microwave.