For those who want to clean rust from a particular object and they don’t have an AC in the house to make an electrolytic bath, there is a solution: VINEGAR.
Acetic acid cleans rust very well, even better than ferruginous. You can clean the verdigris from bronze objects, jewels, etc.
The method is simple, take a pot (or a PET), you put everything inside and cover with vinegar. For larger objects with a thick layer of rust you can leave them 2 days in this solution.
After the metal stands in vinegar, rust will turn into a viscous film that can be easily cleaned with a powerful water jet. If some rust remains, which is well soaked, get it off with a wire brush or steelwool. After that, wash well with soap and water.