Interior walls tend to get dingy over time, as you've probably already noticed. No matter what color they are, streaks and stains start to show, mysterious scuff marks emerge, and you start to feel like you're living in Murkville USA instead of a gorgeous clean home. Numerous commercial products are available for scrubbing down walls and restoring their sparkling clean looks, but many of them are both expensive and not very environmentally friendly -- not exactly the kind of thing you want to be applying to your walls, especially if you have young children and pets who might be especially sensitive to chemical cleaners.
Fortunately, there's a way better alternative. In addition to commercial green cleaning products like Simple Green and others specifically designed for walls, you can also just make your own. These DIY cleaners do the trick when it comes to lifting grime, and they're way less expensive than their commercial counterparts, so you can save big while you're also restoring your home's handsome looks.
By the way, there's another form of savings embedded in washing your walls to remove grime: you won't be applying yet another layer of paint. Some people prefer repainting to washing, but there's no reason to pile on the paint if the underlying paint is in good shape and you still like the color. (If you don't like the color, of course, you're definitely looking at a new paint job and a phone call to your Cleveland painting contractor -- but you should actually wash the walls first anyway, to help the paint go on more easily, reduce the risk of stains seeping through, and keep mold and mildew out of your walls)