Originally Posted by
GrumpyDiver
That is definitely sensor dust, not something on the lens.
If your run your camera's cleaning cycle 5 or 6 times, it may be enough to dislodge the dust. It that doesn't work, a bulb type blower often works and that does not require any physical contact with the sensor.
I have cleaned my sensor with a dry sensor cleaning brush once and I've had my current camera since 2012. I've never done a wet clean. The sensor has a glass filter assembly on it and that is what you clean, not the sensor itself. You need to be careful, but it is not nearly as fragile as a lot of people make out.
I just use a healing brush (in Lightroom or Camera Raw) to spot clean the spots that are on any images. Its fast and easy.