Originally posted by monochrome My experience has been wet cleaning doesn’t remove much, it just moves it around and streaks the sensor. I assume if Pentax thought wet cleaning was the best solution there would be a Pentax-branded wet cleaning product.
Again, a matter of technique and practice, I'd wager. The video I linked to summarizes some of the wet cleaning "secrets", and picking dependable swabs and fluids is another thing to look out for. Replying to an email enquiry, VSGO expressly confirmed to me that their cleaning liquid was safe for use on AA-filterless sensors like the one of the K-3. Properly executed, wet cleaning will give you a squeaky-clean sensor without anything that could be detected by the Dust Alert feature nor by extreme pixel-peeping.
It may be just a feeling, but I am also under the impression that the wet cleaning makes it less likely for something new to stick on the sensor for quite a while after the procedure. But as with so many things, it ultimately boils down to what works for the individual user, I guess.