I have seen "hot rod" guys do entire Model A bodies in large swimming pools of the mixture...and MV restorers dunk sections of well rusted track. The metal is so clean when it comes out that within minutes of being washed it starts to get a gold tint to it as it begins to flash rust...you can get a product called "hold tight" that you mix with water for the rinse which will keep the surface from flash rusting for several days, it is often used following "wet" blasting...Colin I would recommend filling the gearbox with the mixture and allowing it to sit...would make dis-assembly much easier
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