I’ve restored a handful of tools in recent years and removing any rust that may be present is usually the first step. After trying a few rust removal products that were mediocre at best I stumbled upon Evapo-Rust.
It has worked extremely well on a Stanley miter box I’m working on and (according to the label) is non-toxic, environmentally safe, and no fumes (I’d say mild fumes after using it). If you’re looking for something to help rid your tools of rust give it a shot, though I’d look for the 1 gallon bottle instead of the 1/4 gallon, it’s about 40% cheaper. I purchased mine at Autozone, but according to Evapo-Rust’s website, Advanced Auto Parts and Lowes are also among the retailers who carry their product.