: Burn stains inside microwave I heated a dish that my local fish store said was in a microwave-safe aluminum foil. Now I have a brown (chocolate looking) residue, mostly on the sides of the inside of my microwave. I have read

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No, please don't!
I would get a professional micro-wave cleaning liquid: Acetone is a prohibited product in some countries nowadays as it's highly flammable and slightly toxic whereas in some countries it's still readily available in cheap nail polish remover. As it's a strong solvent, it will damage most plastics including white plastic microwaves.

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Acetone is not considered a carcinogen in the United States

The Material Safety Data Sheet can be found here.

It is the active ingredient in regular nail polish (varnish) remover.
It may remove the 'paint' from surfaces.
It is legally sold in the United States.
It is highly flammable and explosive in the right concentrations.

I would not recommend it to clean your microwave as it's hazardous to health if used improperly under a variety of conditions or used without proper safety equipment.

I would also advise against placing an aluminum foil pan in the microwave and turning it on.

Where did you get this misinformation, Connie?

I have read that I can sprinkle baking soda, then add acetone (followed by liquid coffee) to remove these stains.

The above is incorrect!

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Please do not use Acetone or Nail Polish Remover!

Here's a generic Nail Polish Remover ingredient list:

That's not good stuff to have around food preparation products.

To clean your microwave safely and chemical free:

1) Buy a lemon or two

2) Cut into pieces

3) Place in a microwave-safe bowl and fill with water

4) Place the bowl in the microwave and turn on for 3-5 minutes

5) Let stand with the door closed for about 5 minutes

6) Carefully remove the bowl (it will be very hot!!!!) and wipe down the inside of the microwave with a cloth, towel, or paper towels until clean.

The water and lemon juice steam will help loosen and remove grease and other baked on substances, plus it will leave a nice smell in the microwave afterwards. Best part, it's 100% chemical free.

If you have really stuck stuff in the microwave - you can use a mild natural abrasive and some warm water on a towel to help remove it. I recommend using Kosher Salt, since it's natural and won't leave chemical residue in the microwave afterwards.