Just like fabric softener sheets create a barrier for dust, their liquid counterpart will do the trick too. Use a DIY fabric softener solution and just spray.
Picture: Anne Swoboda/Flickr
Reader's Digest suggests:
Clean glass tables, shower doors, and other hard surfaces, and repel dust with liquid fabric softener. Mix 1 part softener into 4 parts water and store in a squirt bottle, such as an empty dishwashing liquid bottle. Apply a little solution to a clean cloth, wipe the surface, and then polish with a dry cloth.
This seems like a more convenient way to spray fabric surfaces too -- although you want to be careful not to ruin anything, of course. For more dusting solutions, check out their full post.
15+ Simple Dusting Tricks [Reader's Digest]