I have lots of left-over fleece from making Christmas gifts. These are dusters for your Swiffer dusters made from my left-overs. The fuzzy one in back is for your hand duster. I made mine out of fleece but they can be made of any fabric. I think flannel would work especially well. There is a website that explains how to make the hand duster cover.
The one in front is for the floor duster. I simply cut a piece of 5" X 18" fleece for the base. Then I sewed down the middle of six pieces of 2" X 10" fleece. You are finished with your duster cover. Just wrap the ends to the top and poke into the holes. I like both of them because they can just be thrown into the washer.