I use a swifter on mine. I have wood blinds and that is how I can easily get dust off. Here are some more ideas if you have other kind of blinds.
don't have blinds, but how about a Swiffer duster?
I tend to lay them out on the grass and blast them with the hose.
If horizontal blinds, I take down and put in bathtub with soap and water. Then let them soak a few minutes and dunk up and down. Then put against the wall on a towel to drain. Then put up and wipe off wet ones. One at a time in tub.