Yesterday I called a rather chi-chi camera store in Palm Desert to ask if they had any sensor cleaning stuff; my new-ish D3s sensor was covered in dust bunnies. They said they did and I went in. When I arrived they told me it is risky to do that oneself using a brush as the D3-series sensors have a little oily frame around the sensor and it's easy to smear that oil on the sensor when cleaning it, which they characterized as a big risk (they recommend the paddle and fluid method which I don't have). Well, I just wanted get right back to shooting and they said they'd clean it in 15 minutes for $45 and I said OK. Now I've always cleaned my own sensors with a brush and compressed air and this was the first time I'd been told "don't try this at home." I didn't really mind the cleaning fee (I'm 3,000 miles from home and shooting all the time) but I wonder how real this risk is. Any thoughts?