What are the proportions to clean a microwave with lemon juice?

All you need is a cup of water with a couple of drops of lemon juice. Turn the microwave on for 5-10 minutes, after wipe down and ......clean.

Forget lemon, put cup of vinegar or apple cider vinegar in for 2 mins than let it set 4 or 5 mins than wipe dry. Millie

https://www.hometalk.com/diy/clean/microwaves/how-to-steam-clean-the-microwave-2353782?r=1

A half cup of water and the juice of one lemon should do the trick!

1. Pour water in the bowl: Measure about a half cup of water into the bowl.
2. Squeeze the lemon: Slice the lemon in half and squeeze the juice into the water. Drop the lemon halves into the bowl.
3. Microwave for 3 minutes: Place the bowl in the microwave. Microwave on high power for 3 minutes so the liquid comes to a boil.
4. Let stand for 5 minutes: Do not open the microwave door. The steam trapped inside will help loosen food gunk. Let stand for 5 minutes.
5. Wipe the microwave clean: Open the door and carefully remove the bowl with the lemons. If your microwave has a turntable, lift it out and wipe it clean. Wipe the inside of the microwave clean starting with the ceiling and the sides. Finish with the floor, sweeping any crumbs into your hand. Don't forget the door!

Cleaning stubborn spots: If you come across stubborn spots that won't easily wipe away, dip the corner of your dishtowel in the lemon-water and scrub until the spot comes away.

Here is my tutorial - https://chascrazycreations.com/clean-kitchen-natural-products/

2 lemon cut in 8 parts + 1/2 cup of water ... microwave to boil