http://www.nikonchat.com/cnet-nikon/

Housewares, each photographer must have spring is here, and you know what that means spring cleaning. This could also be a good time to consider cleaning your camera. Whether a simple dust off point and shoot, or any more serious dust removal of the lens of a digital SLR camera, it would be prudent to have some tools always around to keep your camera clean and working well.
Can I use a Nikon lens on a Canon camera? – CNET Australia