for polish, I use prism polish - best I have used, reasonable price
. easy to use.
Also have used spotless stainless (SS) for hard to reach areas, and for smaller items (shackles, blocks, etc). It is not very fast, but it IS effective if it stays wet. It evaporates fairly quickly and is messy to use. Need to rinse it. I usually will put some SS in a plastic bag, put the item in it, ensure SS gets all over the item. Wait til the next day, rinse it off..like new!
Haven't used SS on railings/etc, as I prefer the instant gratification results of the prisim polish, fast and easy, and leaves a protective coating (good for half a season or so). Where it is warm out here lately, the SS product would dry too fast before it could work well..would have to cover it with plastic wrap or something.. seems like too much effort and mess for easy to polish stuff like railings.
But used as directed (and kept from drying) the spotless stainless stuff does work quite well!