Clean Unistall and Re-Install

OK, I guess I have learned my lesson about installing wizards etc from sources I didn’t know were suspect. So I’d like to get back to my original, clean OSMC installation and get rid of all of the stuff that’s probably causing my problems. So for a RPi 2, what is the recommended way to uninstall everything and get back to a clean, fresh OSMC install?

Question is if you are just talking about Kodi Addon’s or other installations you have done.
The most cleanest approach would be to reimage the SD card, but that means you loose 100% of your configurations.
Second way is just to deleted the .kodi folder and reboot. That will clean everything you done in Kodi (and means you loose all Kodi settings).