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I've been using wood bleach for several years to remove rust. Pretty inexpensive and it works well.

A couple of weeks ago I picked up two engines and a few other Model A related items. Included with them were 6 spark plugs. To give folks an idea as to what wood bleach can do I put the spark plugs into a solution of about a quarter cup of powdered wood bleach and about three cups of water for 48 hours.

I purposely didn't clean the spark plugs prior to putting them into the solution and didn't disturb them while they soaked.

1st picture is how they looked going in, 2nd is close to the end of the 48 hour soak, 3rd picture is after a light scrub with a nylon brush under running water and the 4th picture shows the plug on the lower right after a couple of minutes of wire brushing with a fine grade wire wheel.
Not only does it remove rust well it makes the porcelain on spark plugs look like new.

Freeing up rusted window regulators, door latch assemblies etc... using this method works well too.

Just thought that folks might find this useful.