Was it DVC Jen who got her camera professionally cleaned and it turned into a colossal, heart-and-wallet-wrenching nightmare? (I guess so, since I see tinksdad mentioned her too.)
It's really pretty simple and easy to clean it yourself. A bottle of Eclipse, some pec-pads, and something to wrap them around.
Definitely try a rocket blower first - that can get off most dust you'll encounter.
Also, on your test photo, do "auto levels" if using Photoshop... if you Irfanview, you can do "auto adjust colors". Other programs may have similar tools. This will emphasize the differences in colors in your plain white paper photo, so that dust spots will be very easy to see.