Rust remover is a liquid that can be used to remove rust. A homemade rust remove is white vinegar. It can be sprayed directly onto the rust.
To get rid of rust on your John Deere 730, you should find a rust remover. Then apply the rust remover on your tractor. This should remove all the rust.
CLR (Calcium, Lime Rust) Remover.
Nitric Acid
Yes
Any good quality rust remover can be used for rust removal on many surfices.
There is no rust remover that going to repair the rust that has accumulated on a car for that long. It will be best to have the floor repaired by a professional.
Whink rust stain remover
Most simple rust removers contain phosphoric acid, which dissolves flaky or granular rust, but does not seriously attack the parent steel. In fact it leaves a fine coating of iron phosphate which is a slight protective, and provides a good substrate for paint. Scrub off as much of the flaky scale rust as possible - for this just wastefuly consumes the rust remover.
Whink Rust Remover will quickly get rid of rust stains and best of all it requires no scrubbing.
Buy Evapo Rust Remover. I have never tried it though. Use at your own risk. ____________________ Sandpaper and steel wool are also effective in removing rust.
Nitric Acid
Try some CLR, calcium lime rust remover