Many ‘old school’ watchmakers used benzene or pure Naphtha. In the modern age, both of these have been found to be bad for your health if inhaled.
Watch Technical Details
Cleaning and Oiling the Movement of a Rolex Watch: The complete Guide
Cleaning and Oiling a Swiss Watch Movement
How To Clean Your Watch - Hodinkee
Practicing on a '70s Waltham (ETA cal. 2789) & introducing my new cleaning machine – Sky Corner
watchmaker Archives - BUZZUFY
Here's Why You Should Learn To Service Your Own Watch - Quill & Pad
cleaning Archives - BUZZUFY
3 Signs That Your Automatic Watch Needs Serviced