Fog will be gray colored - like a very faint highlight. Uncleared ferric will be yellowish brown. For what it's worth, I have never successfully cleared an insufficiently cleared print after it has been dried. I think it just probably got locked in the first time through your process. I would still dispense with the tap water rinse after development, and go with the long soak in the developer in lieu of the tap water step.. I suspect you may have a water pH issue similar to mine.

As an aside, the same pH issue also makes my gum prints get loads of dichromate staining. Kerik uses essentially the same process I do, but with a different tap water source, and he never gets dichromate staining. Cherchez l'eau.