The 10" 4-in-hand will be most useful. It's surprising how much difference 2" makes in speed and comfort of the work.
I've had good luck with evaporust. I don't get much mileage out of it however which makes it pretty expensive. A couple times and it's toast. Do you find the same to be true?
It's more expensive than vinegar, but I still find that it's reusable enough. Anything with heavy rust I knock off the excess with a wire wheel first to help save the solution. I only use it for items with surfaces that a wire wheel can't touch on every surface, like adjustable wrenches, pocket knives, machinist calipers etc. I like it because it's skin safe and doesn't pit the good metal. I probably go through 3 gallons a year, or $60.
Online auction, there is another (slightly smaller) up now, without much label, that will go for way less no doubt.
stopped at 1 garage sale this morning on my way to buck knives factory in Idaho and got these goodies...
I like evaporust quite a bit and use it pretty regularly. anything small that can't be wire wheeled or that has moving parts, etc. I'm always surprised with how long it lasts actually. I'd personally never use vinegar because I hate the smell of it.
Guaranteed one whiff of the stuff and I will vomit. I've never used evaporust but I hear great things, if I ever need to result to soaking I may try it.
I've never tried it, but after the endorsements here I'm going to. It sounds like it's best to immerse objects in it. I'm wondering if I soak some paper towels in it and lay them on a crosscut saw and then cover that with plastic wrap to prevent evaporation, if that could make for a chelation-friendly environment. Sure would save a lot of elbow grease.
A 6' x 8"x 2" (filled 2") trough quickly tacked together and lined with plastic would only need 5 gallons. This is an intriguing concept to me.
Good scores there and all from one yard sale. At one time I used a flax water bag quite a bit, they work well.