I have a chesnut as well. The if you do use baby wipes, make sure he is 100% dry before you put him back in his stall, pen, ect. The wetness will attract dust. Escpecially if he gets a chance to roll. Do you own a natrual horse hair finishing brush? They can be a bit expensive ($15.00-20.00 for a nice one) but I've had mine for about 6 years. Using that with a flicking motion should knock out most of the dust. He could also just be in need of a good bath. Make sure you rinse him completely off afterwards, stuck on shampoo will attract dust as well. Same as old sweat. I give my guy frequent (water-only) showers.
Hope this helps.
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