I worked on the camera again and it looks like most of the dust is gone!
The Visible Dust sensor loupe sounds like a good idea. It was rather frustrating trying to figure out where the dust when I couldn't even see it. That, along with the Green Clean system, will make a good DIY sensor cleaning set for future cleanings. If I don't get the sensor loupe myself before Christmas, I may put it on my wish list.
I'm thinking that what most likely happened was that the dust got stuck on in the process of changing lenses in the humid outdoors that charaterizes Florida in the summer--the humidity got into the body, along with the dust and when the sensor dries, the dust is stuck on.
With getting a second body soon, I'll be able to minimze lens changes, which will also help.
I'm considering getting a better blower, as well.
At any rate, thanks for all the help!
Heather