I am a professional photographer, one that earns a living shooting for a magazine, and a member of the National union of Journalists and a freelance journalist.
It makes me laugh I have never cleaned a sensor in my life and I have owned so many cameras from the Canon EOS10D, I change lenses on beeches, underground and trackside at sports events, and in 25+ years have never cleaned a sensor NOR needed to
I shot a presentation at the last P1 Superstock race any my Nikkor 14-24 got a Champagne shower, a wipe with a damp cloth on the lens and front element cleaned it all.
Oh and I buy my gear it is not supplied free
If I ever did want the sensor cleaning.....remember....,
shops are INSURED against damage they cause to sensors and the replacement costs, are you 
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