Excessive dirt

[MountainMan]

My solution to the "static dirt" problem was to place a filter where the heating/central air conditioning vent enters my layout room. It's very dry here in the Colorado mountains, and static buildup is quite common. On many days I can create a spark when I walk across a room and touch the light switch. At night, the small, blue spark is clearly visible! 8-)

You might consider adding some humidity to your room to counter it, and you could also consider an electrostatic air filter which will precipitate the offending particles from the air.