My cornies are really dirty inside, a lot of soda residue.
I added a scoop of Oxiclean and mixed it well with 5 gallons of hot water. Pressurized the keg with O2 to seal and let it sit overnight.
How long can I leave Oxiclean in the keg before washing?
I left Oxiclean in my Keggle for about a week, in that week a layer of crud formed on the bottom that had to be removed with vinegar.