I'm surprised that so little people suggested fire.
Baptize the damn thing with fire .! Most of my comments below are made for "low quantity lab use".
For large amount of work, a hot solder pot with an aggressive flux dip is the key.
Just keep a lighter around.
Most of the coatings can be burnt away with hot iron burnts to a molten bulb of slag and broken off after it cooled.
And even the temperature resistant ones lose their elasticity and become somehow brittle after the beforementioned baptism.
Than you can scrape those away with an almost sharp object.
Oxide layer either can be cleaned mechanically afterwards, or if not too severe, left there for flux to handle.
Also, inside edge of metal tweezers are quite good for scraping the enamel.
Most tweezers edges has just the right sharpness for the job.
Pinch it with your thumb and pull. Turn the wire between pulls and voila....
Cant imagine having a molten solder pot in the lab or bench all the time.
And they take some to heat up.
People who suggested molten bath of lye scare me....