As a first try, have a look through the menus for the sensor cleaning programme - it's there somewhere on a6000s. Pretty good for small dots, inconsistent on bigger ones. Takes ten seconds and no kit required.
Yeah, that was the first thing I did after seeing that 'senor spot' example. I remembered seeing it in the menu and my Canons have it too. Didn't fix it.
As a first try, have a look through the menus for the sensor cleaning programme - it's there somewhere on a6000s. Pretty good for small dots, inconsistent on bigger ones. Takes ten seconds and no kit required.