Hey,
After posting last night I went to the garage and stuck this old wheel, I think it was off a Thunderjet or a Meteor flight, into the Oxalic acid solution. The tub I have had some parts soaking in it so all I did was dip the part of the rim that would fit into the old mixture. This stuff was made about 5 weeks ago and has had a bunch of things soaked in it. The rim was in it for about 11/12 hours. All I did today was take it out and wash off the solution.
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Now I have to finish cleaning it. If i keep dipping and turning it will take me until next week...guess I got to get a bigger vat.
You can find some really inexpensive suppliers of Oxalic acid online or on ebay. I haven't tried any of the other suggestions,Yet, but I am happy with this stuff.
Have Fun
Tom