I have some residual junk left behind from apps which I had uninstalled - and these are extensions and system preference type things really - which I cannot find any way to remove. The two in question are Karabiner (key remapping tool), and USB Overdrive (mouse acceleration killer). Neither installed into the apps folder but both had their own "uninstall" buttons internally. After uninstalling both of them they appear to be gone, but looking in system prefs/users & groups/login items, I see both are still there. I tried an application called Appcleaner, but that wasn't able to find either. Is there any way I can purge my system of these app remnants? Thanks!