Maybe I am anal, but all my soft goods go into the washing machine. Hopper and mask get stripped down and washed in water (not the electronics obv, but they are checked for paint). Get new batteries because they are the cause of most issues.
Marker is stripped down and I go through a basic service ensuring everything is lubed as it should be. No need to replace o-rings every time you play, but I felt the strip down and rebuild was good for a few reasons;
It ensures you KNOW your marker,
It ensures your marker is cleaned of ALL paint, no little bits hidden behind a grip or the eyes
It ensures that the next time you take it out the box it is working 100%. (Always leave site with some air in your tank for testing following the strip down)
By doing this, I KNEW for certain that my marker would work every time I took it out the box. Not only would it work, but I can be sure of the state its in and it has never let me down. My first marker I ever owned was a cheap Chinese thing that I bought 15 years ago and it still works. I stripped and serviced that every time I used it too.
Like I say, maybe I am a bit anal, but that was my process