I have ask them.... Do you autoclave needless? And the answer has been so far "No... and if you find a shop that does... run away."
Just my experience. Everything else I actually over see the artist do. Most of the artist I have worked with I have develop a base of trust. Specially for big pieces you tend to spend allot of time together so you get to know each other.
Most of my artist use fkirons and neotat machines and this new style machines "rotary" are mostly modular and the needle are like a cartridges and(to my knowledge) autoclave wont work on them... They must be trashed...
The grips are also disposable and I see them trash them. Cables, machine, power control, and grips, all get sleeved with plastic. Lots of alcohol use to disinfect chairs and surroundings..
Work bench is also wrapped...
I pay attention to all this... and no matter how many times or years I spend with my artist they never skip anything.