The best solution for the self-cleaning of the sensor

The Swabs of VisibleDust are very expensive, but there is unfortunately no alternative to the otherwise self-cleaning.
Etc. with the precleaning Arctic Butterfly Sensor Brush any loose dust particles (do not use a bellows because of the dust only uniformly distributed in the housing or even suppressed in corners there were dust-free) to remove.
Then wet cleaning with swabs and a proper cleaning solution. The fear that one is eventually captures scratches when used properly unfounded. For example I have for years used the 1.6x Swabs from the same manufacturer at my previous APS-C often and never caused a scratch or damage.
Make camera manufacturer service and cleaned, but this is much more expensive: only alternative.