Be very careful before your sure the OC is gone. A lot of stuff can sit on the surface of OC and kill the beading. I find some surfactant cleaners, wheel cleaners, etc... can do this. Could be something in a soap or something in the environment as well.
Before you convince yourself the OC is gone. Wipe it down with 20% IPA. That will remove most films and bring the beading back if its still there.
The reason I know this to be true is I see it all the time on OC'ed wheels and surfactant wheel cleaners. After cleaning the wheels, they loose the beading. Once you wipe them down with IPA, that removes whatever film the wheel cleaner left behind. Claying may also work, but you won't know if its the OC beading - or a film left by the clay lube, as most have some polymers. So if you clay, do an IPA wipedown afterwards.
If the OC is gone and your going to re-apply it, IMO the best thing to do is to use Optimum's polishes prior. At least finish with an Optimum polish or use Optimum Finish Polish as your last step. That is what Optimum recommends, so far its working for me.
