Not OTC, but anyhow...I usually use the Klasse twins on black plastic trim (not rubber but plastic). On surfaces where that's not the solution I use Autoglym's Bumper Care. As best I can tell, it has some very light abrasives that help remove wax/etc. If you buff on the excess after a short dwell time, it doesn't run much (if any) in the rain. Doesn't last forever, but none of the other dressings I've used last much longer. You don't hear about the Bumper Care much here at Autopia, but I can't recall anybody being dissatisfied with it.
On the Endurance- I had an old bottle of it sitting around so I used it on my mechanic's loaner car's tires, this was back in March. I just returned the car (late July) and the tires were *still* looking OK. Pretty amazing durability, almost made it worth the hassle of applying the stuff (but I'm sticking with my Z16).