abbeysdad said:
Anybody know if AIO/SG works as well on textured black plastic trim as well?
These outside-the-box applications can be tricky, so IMO the best answer is "maybe, it all depends". Having posted that disclaimer

the answer in *my* case is "almost always".
I've used the Klasse twins on the textured trim of numerous vehicles, most notably a WRX and the MPV. I worked ("works", in the case of the MPV) great. This is one application where I do use the W-O-W-O technique, it seems to give a more uniform appearance.
I've used BF and UPP on sorta-similar surfaces on the Audis. It works until they get too worn.
I just used 1Z polishes topped with 845 on these surfaces on the new beater, a '00 Blazer, worked great.
I use both the Klasse approach and Souveran on various similar surfaces on the XJS (Souveran works great on its *rubber* trim as did the Malm's wax I used before that).
On the Volvo (240 wagon) I used both Z16 (never ran like in those pics, but I buffed, buffed, and buffed again) and Collinite 476S. I liked the 476S approach better, but it'd start to look pretty bad after a few months if I didn't refresh it. The Z16 looked crappy much sooner, but it was a different type of "bad look" that wasn't quite so awful...sorry, it's hard to describe. Anyhow, I ended up sticking with the 476S approach. This was on exterior plastic *and* the rubber bumper covers.
Note that *some* polishes, on *some* plastic surfaces work OK..the 1Z on the Blazer for instance (don't try that with 3M PI-III stuff!). Pinnacle's PCL has also worked OK for this sort of pre-LSP prep but that was the older, more citrusy, version. AIO is a safe thing to try but I don't consider Autoglym SRP a good choice for this.
When I can't use the LSP-type approach, I generally use Autoglym's Bumper Care. It's a thick gel with some mild abrasives that help clean off wax residue and other stuff (including oxidized material). It doesn't run in the rain for me and I'd notice it due to the particular pieces I use it on. But again, you gotta rub rub rub off any excess. Doesn't last as long as the LSPs but it's good for at least a few washes.