How often do you remove dust buildupfrom your layouts?

I use a soft bristle detailers brush and a shaving cream brush to dust the layout and the trains.

I have a special brush I bought from a brush maker at a German Christmas Markt that is excellent for dust removal. That being said I have a very serious dust removal challenge since many of my trains are on the tracks during the plastering/scenery operation and everything has a thin film of dust on it that should be removed. In addition, the track itself is a mess with various deposits of spray glue, plaster, and now paint on it. Even with masking and continual cleaning it's still terrible and will have to be carefully cleaned before train ops start again.

Oh,

I thought the dust added to the weathering concept.

I dust the 1:43 cars and passenger car roofs every 2 months. The rest is "weathering".

That sounds like a plan.

I have a small diameter hose and delicate brush fitting I put on my shop vac and I go over the entire layout and all my locos and rolling stock about once every two months. 

Dust??? What dust??

I love the "Dust??? What dust??" reply from above!  Seriously?  I try to make myself just clean the track at least once every week.  I have a super long main, 231 feet, therefore really I pick a block, or two or three and do it every week so the track as a whole gets cleaned about once every three to four months and that is a chore enough.  Fortunately, my basement never gets dust!  And I have some swampland to sell too!   

They say that when your fireplace ash pit is full, it's time for a new house.  The same applies to dust and layouts.

It would be great if we were all rich enough to entirely enclose our layouts with plexiglass and have an air-cleaner system.  I imagine that some where some one actual does.

They're called museums...

Surprisingly the very large layout in Chicago is out in the open.

My layout is tinplate, so there's a lot of shiny surfaces that show dust badly... but fortunately they also dust easily.  I use Swifter dry pads, they attract and remove the dust rather than just stirring it up with a brush.  Lots of vacuuming too, but the Swifters work really well for smooth surfaces.

Dust on my layout is a real problem and I hate it. Going to use a large artist brush and my Rainbow vacuum with a tiny long plastic tube used for getting into hard to reach places. I need to get the dust sucked up but not switch lanterns, signs, people, etc.

clean twice a month. wipe it down with paper towel and household cleaner, light scotchbrite pad, vacuum. good results over ten years, atlas track

engines and track as needed.  I just tell everyone that its the way i age my rolling stock,the dust gives everything a gray tint.

It's ironic that I saw this thread first thing today, I had to dust a section near a corner where a spider was in the process of building a home! 

What scale was it working in?

I dust my layout once a month. 

Since I'm in the process of plastering everything, I'm in the process of "Creating Dust" not removing it. In a short while, I will have to do a major track cleaning since—even with post-cleaning and masking—the track has paint, spray glue and plaster dust on it which makes running trains very erratic.

We do it once a year. No small task based upon the number of structures on the layout. The trains ear dusted as needed.

I don't know about spiders, but the dead flies that litter my layout at certain times of year are pretty much scale crows.  The local authorities do not know why there are so many dead crows laying around.  They're dropping like flies.

When I built my layout I ran central-vac tubing through my benchwork so there are 4 convenient outlets around the layout (30 x 40 room).  One of the best things I did with the layout.  Use it all the time.

Custom made "air filter" system. 

I have built a filtering system made from a box fan and an ordinary household furnace filter. This filter system "pulls" air through the filter and reduces the amount of dust that can settle on the layout.  This is especially helpful if the railroad room is kept closed most of the time. Also those rolling stock and engines that remain on the layout are covered by a temporary removable covered "car barn" made from cardboard. All other rolling stock and engines not being used are placed in their original boxes for safe keeping.

This system is especially useful in the colder months when a whole house blown air furnace is operating since such a furnace contributes additional dust in the air.