https://www.reddit.com/r/typewriters/comments/1lu9173/turns_out_mineral_spirits_are_illegal_in/
Traditional mineral spirits are illegal in some states in the US including California. As an alternative odorless mineral spirits are low VOC, safer, and a solid alternative. Typewriter shops like Typewriter Justice in Keller, TX recommend it. Some who have access to cheaper mineral spirits still prefer the odorless version for the reduced residual smell.
Nashville Typewriter, another shop, recommends camping fuel (aka white gas) which is mostly naphtha. Zippo lighter fluid is primarily naphtha, but is much more expensive. In Germany, it goes under the names of Testbenzin or Reinigungsbenzin.
Jennifer Colombo, a repair person of Colombo Collection suggests linseed oil to clean and protect metal surfaces and create a barrier against rust and oxidation.