you can cook the Ti nozzles until all paint residue is burnt off (just like a self cleaning oven,) and not hurt them. Now, I don't recommend that at all, just saying - they will handle any solvent used in airbrushing, or painting without issue.
That said, the Evolution has the Brass nozzle. They can be soaked in Restorer for long periods of time without issue. Paper Points are excellent for cleaning after soaking. Lacquer thinner or acetone are also very good on paper points for cleaning.