We have wood heat, and a lot of dust so I should do it pretty often. I don't. I do have one grandson who must be OCD as about every time he visits he cleans and organizes one thing. A bookshelf, my pantry and over New Years it was the top of the refrigerator. I have several bookshelves with books and DVDs on them so dusting is quite a chore. If you leave dust alone it'll just make an even gray haze over things and it'll all look the same unless some smart alec comes along and writes in it, which no one would dare to do that in my house.