Every now and then the topic of sensor cleaning comes up, and I'd like to know if there is a prescribed "maintenance" period wherein a sensor HAS to be cleaned, for performance sake.
I ask because I have'nt once seriously cleaned my D60 sensor ever since I bought it in early 2003. I've never had to, and every now and then I fold up the mirror and use a blower to dislodge the occasional spek.
My worry is whether over time CMOS sensors accumulate grime, or other stuff that might stick (and perhaps corrode over time?) and thus warrant a more serious swipe.