After the end of life of my earlier premium compact I decided to unscrew the whole camera (there were dozens of little screws :)) keep the sensor as a symbol and a reminder, and simply keep it by heart. It served me very well.
dpreview.com/products/nikon/co...
As I am not doing real product macro photography now I see in how many details must one be patient. Dust can be very sneaky in a specific light.
Therefore no wonder that laboratories and authorized optics services have a sterile working environment.