Lightly spray a disposable duster with Pledge (or any dusting spray) and run it over your closed blinds. The spray makes the dust stick to the duster, making your job oodles faster and easier. I cleaned all my blinds in a flash and have the evidence to prove it! (This is about as embarrassing as my facial mask photo.)
If cleanliness is next to godliness, I do believe my blinds have been saved!