Rust Remover

[HectorLooi]

I recently found this product while browsing in a hardware store. It's a phosphoric acid based formula.

I just dig through my box of junk movements and found one with a lot of rust in the keyless works.

So I followed the instructions and made a 1:5 solution and tested it by soaking the clutch wheel and winding pinion. 

To my amazement, the parts could actually start bubbling in the solution.

I took them out after 15 mins, rinsed and dried them, then wire brushed them. The remaining rust just crumbled away into a fine power, leaving the bare metal.

So, @Nucejoe, if you can get this product in your neck of the woods, I would strongly recommend it. It's industrial strength coca cola. Just don't drink it.

 

[Jon]

Oxalic acid also works well. 10% oxalic acid to 90% deionized water. Also great for cleaning limescale from kettles and toilets and is as cheap as chips compared to ready-made formulas. I also use a ready-made phosphoric acid which is pretty good at removing rust. Phosphoric acid is an ingredient in Coca-Cola