You might not think of your bag as a collector of tons of dust, but the inside holds much more than you think. Along with stray coins and a few candy wrappers, getting rid of clutter keeps the rest of your stuff scratch and gunk free. After cleaning out your bag and giving it a quick shake over a garbage can, then run a lint roller over the interior and exterior, removing sheets from the roller as needed. Continue until the lint roller paper is clean. And this works great for computer cases, too!