So I ate a sandwich, chewing on the other side, and got started on things. Drug my two trash containers up from the alley to the garage and started in sorting though the stuff. I have, so far, gone down the left wall of the garage (as one enters) and tossed about a half a container's worth of stuff. Other things are set aside to donate. Another chunk are "survived the first pass" objects that I'm not sure will stay.
The amazing discovery so far: I have five, count them, five snow shovels. I have no idea how I acquired all of these as I don't recall buying a one of them.
Having a small beverage and ear-warming break now and then it's back out to tackle some of the shelving units.