Buying a camera and a lens is a big investment. Keeping your investment clean should be a priority. Cleaning kits that are designed just for digital SLR's and lenses are available. The cleaning kits are for the most part under $20.00 but some are more but that's because the size of everything in the kits is bigger.

Making sure your lens and camera is clean is key too keeping the high performance you get when you first got it. Using a lens that is dirty creates blurry and inaccurate pictures. The problems you can run into if your camera gets too much dust in it are big. Just keep your equipment clean there is no excuse why you shouldn't.