Cleaning a microwave should NOT work up a sweat. It used to take me about 45 minutes to do a decent job on a very dirty microwave, luckily not any more. The best way I’ve found to accomplish this task, with minimal elbow grease, is to use white distilled vinegar. Place one part vinegar and two parts water in a bowl and microwave it on high for 5 minutes (you will need a microwave safe bowl, preferably glass). Once the 5 minutes is up you can take the bowl out immediately (just be sure not to burn yourself, maybe use a hot pad). I prefer to wait a few minutes to open the microwave and remove the bowl and then all you do is wipe it out with a dishtowel/rag. If it’s still kinda dirty after wiping it out just put the bowl back in for another 5 minutes and then wipe it out again. You should find that you will no longer dread this task quite as much. I love doing this because it is non-toxic and does a better job than any other cleaner I’ve tried. Try it and see what you think.