De-rusting

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Take a look at this re citric . Lots of happy customers. Make sure you degrease well before using any aqueous product.

Just tried this... It works well

The old tool guys use citric acid to de-rust old tools. It is good for old saws, chisels and such.

For larger items that will not fit in a bucket for the soak you should look for a phosphoric acid based product. It comes in several brands which would vary with your location. One local brand here is "naval jelly". The phos acid converts the iron oxide to iron phosphate which is inert. It kills the rust and "seals" the surface to prevent future rust.