When cleaning dust from scale models, sculptures, figurines or LEGO models I use an artist 'Fan' brush. This is the best method I've found to clean dust rapidly without damaging models.
The fan brush's long hairs combined with the thin spread enables you to dust 'any shapes and surfaces without risk of damage. For example, it would clean a LEGO antenna (1 stud attachment only) without making it fall. You can can really push the brush into the bumps and cracks and the long hairs will bend and reach around the features.
Also, when dusting a big piece, I also set an electric fan a low power to blow air across my work table. This prevents the dust from just going up and settling back down on the model.
A huge advantage, learned after cleaning model boats, is that it is also perfect for dusting ropes (small cables). This worked like a charm on my LEGO Technic crane with all the complex cable system. It is also good on cloth, so it would work for the minifigures capes.