I have a 1DsMkII that I bought back in either 2005 or 2006.....never once have I wet cleaned it. I just use the rocket blower. I also have another 1DsMkII and a 5D and I've never wet cleaned them either....in fact, I've never wet cleaned a camera ever. Just use a rocket blower. That said, I don't go looking for dust and when/if it does show up, I simply clone it out. I know that if I go shoot a sky at f22, my sensors will show all kinds of spots.......but I don't often shoot skies at f22 so I find it to rarely be an issue for me.