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Seems there's tons of products out there that might look good, but don't last. The initial costs might seem fair-good, but when you think about the protection they offer, and other problems they cause, they are truly very expensive to use.
Armor All is greasy-oily, loaded with silicone, which of course gives a nice shine, but doesn't last, usually gone within the first rainstorm, or wash. It's protective qualities because of this are basically poor.
It is a major dust-dirt attractant, and I've seen it run down paint finishes, and stain them.
As others comment, and I've noted, it has a nasty tendency to turn tires brown in color.
There's so many more good products available here.
Such as Aerospace 303 Protectant, and another, which I have bought with a recent order from AG/Autopia, is CarPro's CQuartz Dlx. The initial expense seems high, but it's understandable that it is false economy comparing products such as Armor All, and the like to a product like CQuartz Dlx.
While I've yet to try it, and want to do some paint correction first before finally treating trim, this product has recieved many good well written reviews here, it lasts much longer, it dries to the touch, and it better protects than any silicone based product that I'm aware of.
For exterior plastics-trim-cladding, CQuartz seems like one very good way to go. Mark