I had the same uestion it does not remove rust however it does not cause any rust I know this because in my science experiment (the pepsi did not receive any rust). I hope that this answers your question
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Vinegar dissolves rust. If you want to remove rust from an item soak it in vinegar for a bit and that should help get rid of it.
Here is some points that I used for my metal chair. Remove any loose pieces of rust using a wire brush. Remove the rest of the rust using a palm-sander. Remove sand using solvent from hand and legs. You must use high-quality oil-based spray paint specifically for outdoor designed to prevent rust.
If the rust is only on the outside of the microwave you can wipe it down with a cleaning agent for rust. If it is on the inside mechanics, you can not remove it without damage.
Go to your local hardware store and ask them this question. There are all sorts of products to get rid of that rust (most of it) before going to the expense of putting a liner up. Answer I agree: fix the cause of the rust and remove the rust before attempting to cover it up. If not, you will have problems down the road.
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