Any way to clean shadow mask?

[Tenfresh]

I recently moved my arcade cabinet to my new apartment and when I reconnected the monitor (a 25" well-gardner) there was a small black dot in the middle of the screen. It's not on any of the exterior glass, and it's not coming from the video hardware; my best guess is that somehow a piece of something got on the inside of the shadow mask. Does anyone know if it's possible to get it flushed or somehow professionally cleaned? Thanks!

[grantspain]

i think its one of your pixels shot,pretty sure there's nothing you can do about it other than buy a new tube