Don't know if time is a factor in your project, but If you have a week or so to spare all the rust can be removed with basically no effort once you set up for the job. Go the feed store, buy enough molasses to mix a molasses/water solution at a 1-5 up to a 1-9 ratio and cover the rusty items. 1-5 will work pretty fast in hot weather.
To prep the parts you need to totally degrease and rinse well with water. Then submerge the parts in the molasses/water mix. Pull the parts in a week and if still rusty hit em with a wire brush and resubmerge. Check in another week and all the rust should be gone. You may find things are fine after the first week.
Yes, I've used this in the past. It won't remove paint and you can't have any grease or oil on the parts you want to clean.
Good luck, RonR
