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"There appears to be a very sticky gluey residue forming on the uppermost surfaces of the inflatable tubes (where the sun shine hits it)."
I would suspect that what you are seeing is uncured plasticizer leeching out of the PVC. That's a chronic problem with PVC from cheap sources, and from what I've heard it is also a bit toxic, so you'd want to clean it off and avoid exposure to it. Acetone would probably strip it right off, as would many other things. The flip side of the problem is that as the plasticizers leech out--the PVC is literally decaying, even with treatments it is going to fall apart. And if the seams have been glued (as opposed to welded) things like ArmorAll can actually make them come unglued even faster.
Time to clean it up and, probably, scrap it while there's some resale value left to it.