Best methods/tools for dusting off models

I use a similar technique, though increasing the pressure.  I have a bottom (bottle feed) brush, so I take the bottle off before hand and run the brush for about twenty or thirty seconds to make sure there is no more thinner left in it.  I always use the soft brush too.

Compressed air is good, but you can also use a long-handled makeup brush.  Just have to not feel self-conscious walking up to the cashier with it.

Makeup brushes can work well for applying weathering powders.  After all, that's what the ladies use 'em for.

I use a can of air for dusting mine.  The trigger that most of them have on the can makes it easy to control pressure output.  About once a month is sufficient for my models, and they all sit in the open air.  I found that a routine dusting with the can of air blows the dust off before it sits long enough to become stuck.  I tend to be more fearful of the damage that might be caused by physically touching it with something like a brush.  But, like everything else in modeling, we all have our own ways that work best for us.  

I use blasts from the airbrush with the pressure dialed down. If the dust refuses to surrender to the air then I use a very soft makeup brush that my wife was tossing away years ago and small soft paint brushes of various lengths and thickness with the airbrush to convince it to leave the model. 

Jim 

Stay Safe.

Can of air? Really? I would be scared of blowing stuff off.

If I need to I use a big fluffy paint brush to dust them off gently.

I rinse them off in the shower, and let them air-dry.