They just don't clean. I keep cleaning supplies in my office for my own use. Even now and then I do a quick dust and wipe down my equipment. It's 5 minutes of time. 10 if I get the vacuum. Fatties don't bother. 10 bucks on some Swiffers and Clorox wipes is too much, but 10 bucks on chips and soda is a no brainer.