clean http://www.adorama.com/alc/taginfo/clean Article: How To Know Your Sensor is Dirty.See and eliminate dust spots <p><span style="font-size: small;">If you have a digital SLR and change lenses, you have spots on your sensor (and images.) Want to see? </span></p> http://www.adorama.com/alc/article/8341 Article: Clean it up!.How to keep your lenses and filters smudge- and scratch-free <p><span style="font-size: small;">The best way to keep lenses and filters clean is not to get them get dirty in the firstplace. This may sound trite, but every cleaning carries with it a very small risk ofcausing problems. </span></p> http://www.adorama.com/alc/article/8110