You obviously are lucky enough to not have to clean your sensor. :wink::smile:no idea what the post is about but hope the two huge black splotches are on the cloth.
Nick I have not yet used wet cleaning and do understand the pic but not the post. btw despite being in the trades and having little fear of anything mechanical I have yet to get the nerve to wet clean. I do have one spot that only wet cleaning will resolve but for now when it shows up I clone it.You obviously are lucky enough to not have to clean your sensor. :wink:
Those are holes from the white paper that I use to check my sensor.
If you look at the picture and think about it more. everything on the desk is essentially tools for sensor cleaning. The Flash is used to exposed the white paper at f/22 and above. E2 is the cleaning fluid designed for sensor with ITO coating. And the sensor swab is to clean the sensor.