I have a patio table and chairs set, that has now spent three winters outdoors, with no treatment. It needs some TLC. I see that Cuprinol do a treatment regime, consisting of firstly, a Restorer, then secondly an oil or stain, depending on your choice of finish. There are brands other than Cuprinol, too, but it seems to be the most available in this area (best promoted, maybe).
My question: Is the restorer necessary, or is it just a way to extract more money from us? And are there any suggestions for a good or better way to restore the finish? The wood is all in good physical condition, apart from looking grey rather than teak-coloured.
All useful and sensible suggestions welcome.