Here is a question I have wondered about as I have begun expanding my layout. How are you guys keeping your layout clean? I don't mean track cleanliness as I know there are several methods for keeping track clean. I am talking about general household dust that settles on buildings, landscaping, etc.
When I was young, my grandfather kept lightweight bed sheets over his layout but the constant pulling on them to remove them caused some damage to the scenery. Any other ideas?
Honestly, I've not found it to be a problem.
I have high-quality HEPA filters in the main house air mover (which does not have registers near the layout's unfinished basement area), as well as a separate filter for the standalone dehumidifier (designed to be inserted in the air handler, but installed separately in the basement near the layouts, and set to a relative humidity of 55%) and a small ionic filter next to the main layout (only rarely used). Consequentially there's not a lot of air movement in the basement, and what there is, is pretty heavily filtered.
Frankly, most of the needed cleanup comes from episodic construction, either on the layout or elsewhere, especially in my basement shop. I use the shop vac for most of the floor-level stuff, and a rechargeable hand-held vacuum for the layout. I can't say I've ever noticed any heavy dust accumulation on either layout, and for the most part, what dust I've noticed IMHO acts more as a volunteer general weathering , in effect making the accessories and landscape a bit more prototype-realistic than out-of-the-box shiny metal and plastic. Every once in a while I give the top of the track (tubular O-27, in various radii) a rub-down with a scotchbrite-type pad, but I really haven't had many (if any) dust-related connectivity problems.