I am in the process of cleaning up a B5 from the 1970s that I acquired some months ago. Work on the wood sections is proceeding w/o difficulty, but I can't figure out how to clean the lower jacks, which are very rusty. Can they be removed from the loom, and if so, how? For all of the metal pieces that are removable, I'm soaking them in some old Grandma's molasses that I had in the pantry, diluted with water. Has anyone else used this method?