I used a cheap, dry testors paint brush to dust. If you dust regularly (once a month), you should have no problem just brushing the dust away.
I swiftly and delibrately draw the brush back and forth like an archeologist, all the while gently blowing with my mouth upon the area that I am brushing. I start at the high points and work my way down. When I'm done, I move the model so the dust I've made airborne cannot settle right back from where I just cleaned it.