So, many people are scared about attempting a cleaning of their image sensor. I totally understand the worry.
You’ve got an expensive camera. You don’t want to destroy it. Maybe having someone else clean it is your best option. If you feel that way then you’re right, don’t do it yourself. Send it in to an authorized cleaning center. For me, Tempe Camera is nearby, and they do it well.
The other day I noted some junk on my 5D’s sensor that had been there since day one. I broke out my Arctic Butterfly and attempted to clean the sensor. I made things worse. Normally it wouldn’t make things worse. Don’t get all worried if you’re considering doing your own cleanings.
What happened in my case? There was some type of grease / oil on the sensor. It happens with new cameras. How do I know? Read the following thread:
Unfortunately the brush on my Butterfly now has grease on it. I’ll need a new brush. This experience hasn’t dissuaded me from doing my own sensor cleanings, but it has bummed me out. Sensor cleaning isn’t rocket science, but if you’ve got something that’s not dust on your sensor be cautious!