Careful with that sensor swab ....

Easter egg hunt at Compton Verney, although Ariadne looks very worried about something - hopefully not my sensor cleaning efforts.

Results in the extras,  The old 350D has never been cleaned since we bought it in 2007,  the 50D is a lot younger, but has had more lens changes in the time I have owned it. Each of the sensors had one dry wipe followed by one wet, and no going back for seconds.  Next time, I think I'll clean my monitor screen first - it is very easy to confuse dirt on the monitor with something in the check images.