I used m43 cameras for a couple years and never once saw a spot of dust in my photos. I recently got a Pentax DSLR (brand new) and had problems with dust right away. I tried a blower several times after using the in camera sensor cleaner many times and was not having any luck. Then a used a very fine brush that did nothing. Finally, I used a cotton swab and some lens cleaning solution. That removed one of the biggest offenders, but there was still a few others. So I tried it again. This time most of the dust was gone, but the fluid had left a few smears (btw, one is actually cleaning a piece of glass in front of the sensor.....not the sensor itself). So I had another go at it....smears gone, but a few fine flecks of dust. These are much smaller than the ones I had initially and I've yet to take it out and shoot at normal apertures (testing was done at f22 to show everything) to see if they are big enough to be concerned about so I'm leaving it for now. What do you fine folks do about dust on the sensor? Is there some mystical product that does things better? Should I pay for a professional cleaning? Why did I NEVER have a problem with all the different m43 camera I used, but this K-30 is giving my troubles?