I never did a complete disassembly of my machines, but I have polished rods, bars and parts with a wax like quick-glo. It leaved a film of polish behind and did a very good job with out a sonic cleaner. It can be a good idea to have a film of wax or oil on steel parts, it cant prevent rust even years later. If the machine is stored in a dry, heated room it never rusts, but stored in places like a garage, loft, or cellar, rust can appear with just a bit of dampness in the air.