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I recently cleaned the fuel tank on my 48 Chrysler Traveler. It had a considerable amount of gummy varnished fuel in it. I ended up lashing the tank to the open end of an electric concrete mixer. I threw in a couple hand fulls of small sharp stones along with a gallon of carburetor cleaner and let it rotate for a few hours. Tank came out clean as can be. If you try this with your A tank you probably would want to use some small nuts in the 1/4" range as they would have to get past a the baffles in the tank. Also you could use a magnet to help get them out afterward. The odds of you getting all of them back out is at the end of the cleaning is not good but leaving some in there wont hurt anything.