Go to a bicycle shop and ask for a rust remover. It will remove all rust, including that on the wheel rims. For the body of the trike, spray with Rustoleum.
Hi Sue! If it's quite a bit of rust, you could probably use a wire brush and some sandpaper. If it's only a small amount of rust, you can use plain pencil lead and "color" the rust and it should come off. Then paint it with some paint that inhibits rust.
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