We don’t use our microwave that often, but there are still grease and germs in there, so we have to clean it once a month.
I found the easiest way for me, so I don’t have to scrub all day is one cup of white vinegar & a 1/4 cup lemon juice, mix put in a bowl and turn your microwave for about 10 minutes.
Take the bowl out, grab some paper towels and just wipe all the gunk out. Clean and smells nice and takes less then 15 minutes, a little longer depending on how dirty your microwave is.
Even if you have food stuck on there for years, it’s the best solution. You might have to wipe everything down and then do another 10 minute run and wipe everything out.
When I first started dating my boyfriend he had the DIRTIEST microwave, I seriously was scared to use it. This worked and it was actually nice to use afterwards.