When I sit down for some serious cleaning, like after a mucky job or when I've been fingerprinting the lenses left right and center, I use a clean and soft tshirt and clean with a lot of huffing and puffing and then use a hurricane blower or air spray to blow off the fibers. If I'm shooting a wedding and can't pull my tshirt out from under my shirt, I generally am happy to use a soft tissue. It absorbs the grease and cleans off the gunk.