MT Shooter wrote:
Carefully!
Just kidding. First blow off, or dust off with a Lenspen, any dust that may be there to avoid scratches during cleaning. If you have fingerprints or stuck debris the best way I have found is Zeiss Lens Wipes, readily available at Walmarts optical department very cheap. After a good cleaning its always a good idea to do a final polish with a good micro fiber cloth as well.