After I wash my vehicle, I typically maintain it for a couple weeks to make it look amazing for that period. Quick detailers work well. I lately have been using a product called Adam's CS3. Probably my favorite so far. It's a detailer/Waterless wash. If you buy the spray, It's sort of a must to get this as well:
Adam's Waterless Wash Microfiber Towel | Waterless Car Detailing Towel - Adam's Polishes
If it's been a couple hundred miles since you have maintained the paint since your last wash, then spray the CS3 liberally. But if you do this every day or every other day, you won't need as much product.
The idea is that so long as it's just dust, you're fine. You wan't to wipe the spray off gently with the towel to get all the dust off, then buff using a clean side or a second towel. I'd probably get the 4 pack for the towels. Or get the biggest pack. These things are F'ing amazing.
Each application should get a little easier because this is going to lightly ceramic coat the vehicle in the process. Should help with washing as well.
EDIT: incase it was not clear, NEVER USE A DUSTER.