Strange we don't normally talk about cleaning ribs until about April normally..I have the Rib Shop cleaner and preparation. I used it this year for the first time. It seems a little less toxic than the "Inflatable Boat Cleaner" that they sell at most chandlerys but no less effective so for this reason it has my vote.
I had terrible stains and residue on my boat after 2 years of neglect in the spanish sunshine. Tried most things and in the end neat traffic film remover was the answer.