I've been involved in theatre tech for years (Audio and conventional lighting) but I'm a newbie to DMX in general so I'll be asking questions on things that I'm sure you all take for granted. As I wrap my head around operating the lighting system in the theatre I've become involved in, one of my first tasks is getting everything operating properly. First off, we have 8 Source Fours with I-Cues. 6 of them seem to be functioning ok. One is on the bench with a broken mirror (no Idea how) and one seems to have developed a mind of it's own. Pan and tilt just move at random when I try to focus. The whole bar will be coming down soon and my biggest question is, what should I use to clean the mirrors. The are brown with dust etc. I'm assuming the one with the random movement will respond with cleaning. Any advice will be welcomed.