The Power of Apple Cider Vinegar for Rust Removal
I have used vinegar on small parts with great results, but you need to be careful.
Some parts I put in for days to get clean but one time over night was too much, good thing I had extras.
Early on I did some door latch mechanisms and after one day ended up with a sticky film over they parts, from then on I degreased all the parts first.
Alan