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So i have now tried two of these Hama Lens Pens. It has a push out brush on one side that can be used to remove dust from the surface and the other side has a pad that apparently cleans up smudges etc on the lens surface. The first one i had lasted maybe 12 cleanings. After this time it would just produce swirl marks. The felt end of the pen is meant to replenish itself but i noticed it had become dry. The Lens Pen had done a good job getting the lens surface clean and i though i would try a second one as maybe mine was just faulty. The second one was even worse! I used it for maybe 8 lens cleanings and then i noticed that the swirl marks were appearing. I gave up in the end and got a micro fibre lens cloth and just use the brush end of the Lens Pen to remove dust etc before a clean.