One day, many moons and suns ago, I showed up to the studio to shoot headshots for an editor at AOL. I brought my 5D Mk II and two lenses along, but forgot to put something very critical into my camera bag. When doing test shots, I saw something horrifying come up in my images—dust. Though I was able to fix the images, I learned the hard way always to keep my camera, lenses and sensor clean. Here are a couple of items to use—and how to use them—to ensure that my mistake never happens to you.