Somewhere someplace I read not to use the paper lens tissue with fluid to clean camera lenses unless what you are trying to get off is really stubborn. A speck or three of dust is not a problem--people tend to get anal retentive about having a clean glass. I shot over 400 images at a dusty motocross track yesterday and never touched the glass. I did blow a few dust specks off the lens, but never took the cloth out. Ditto on the possible grit in a microfibre cloth--always shake it really good first and wad it up loosly and "huff" on the glass before wiping lightly. All my washed t-shirts are my lens clothes. I try to use the inside of my shirt, not the outside--unless I am sweating or dirty--then I go with the microfibre cloth. I use protective UV filters on all my glass, so I have no fear of scratching the main protetive lens element or coatings. I spray my microfibre cloths first with diluted Simple Green, a nice degreaser, then rinse several times and line dry.