Dust on D800 sensor

Thank you Peter I did the dry cleaning with the blower and then with the artic dust brushes  charged by blusting air on the bristles from an aircan. and still have dust or oil don t know.

here is a couple of pics i took aiming at the cloudy sky at f 22

I am not sure I feel comfortable enough to try any wet cleaning but I probably should or send the camera in.

let me know what you think of the pictures, is it dust or oil?

thanks

the first image is the original JPG the second is  after curves adj applied to it, both are 100% crops.

Danilo