Since I always have time dust on my Pentax Kx and a bellows not always produce the desired results, I bought me this Cleaning Kit. Price is indeed an exaggeration but I find the sensor can thus be cleaned without any problems. There are also some (I think 50) Labels thereby. So this kit is sufficient for at least 50 washings. I really recommend this product because it also stubborn dirt dartstellt no problem. Half the price I would consider reasonable.
