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Likely like you said it is a dirty camera lens, if you can't find it try rinsing that mirror. If it still there after you rinse it use something soft that doesn't scratch to wipe the camera protective lens underneath the mirror. Rinse is important because you want to get rid of sand/rocks from the lens before wiping it, that way you don't scratch it.
Under the side mirror housing, looks like dirt but a rock chip can also cause it
BINGO! Found the camera and cleaned it. Spot is now gone!
That camera is so tiny it was probably no more than a speck of dust.
As a side-note, one also needs to clean the front sensors when driving in sloppy weather. I was in cruise control the other day when it suddenly cancelled and I got a warning message saying something about the sensors being dirty.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
