D600 arrived today with oil spots

Cleaning a sensor is not a big deal. First try whatever in camera cleaning is available - if that does not work then.....

1)  Use the rocket blower - still spots then

2) Use a Lens pen - still spots then

3) Use a wet clean, eclipse, whatever.....

I have been cleaning sensors for a decade or more.

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RonFrank
http://ronfrankweb.weebly.com/index.html