How to completely clear all traces of the app, data, and settings

Uninstall and Reset don't do it, and I've got some weird bugs that don't make sense, and that I can't reproduce in my dev VM, and I can't rule out the possibility that I may have some funked up settings or stuff leftover from previous versions.

Even after using the Repair, Reset, and Uninstall, and then reinstalling, I still have about half of my settings left over, as well as random extra default profiles.

Suggestions?