TLL- Thanks for your info about the use of [pn 1119] to remove shipping film residue. Yeah, the concerns about the downsides of other methods were what I was thinking about. Lots of effort (and multiple washes) to clean it off without marring, and I wasn't 100% satisfied with how the "A" part of ABC worked on it (or rather, didn't work).
On the topic of your credibility and the perceived nature of your posts, let me offer a little friendly advice (and I know all about the pitfalls of offering unsolicited advice

).
Regulars here know that I'm a proponent of using a decontamination system. I've only used ABC so that's what I have recommended. My recommendations are based on first hand experience. And I'm pretty careful about what I use on my S8 (and other vehicles too, for that matter). Again, *NO* problems. If it had caused a problem I would've said so loud and clear. So it simply cannot be said that the "B" step's oxalic acid will absolutely/necessarily cause damage. It just hasn't happened in my experience, and I'm the sort who would notice. So you might want to moderate the "competitor-bashing" tone; as you can tell, it doesn't go over too well here. It's easy enough to advocate a product's virtues without bashing another product.
In addition, as you get a feel for Autopia, you'll find that many of us (already) truly possess "expert knowledge" about automotive detailing, something you might want to take into account. "Speaking to your target audience" and all that...some portions of what you've posted sound a little, uhm, pedantic and condescending.
Finally, if you are not affiliated with FinishKare, well, you sound like you are. Best to keep such associations out in the open. We have manufacturer's reps here who are clearly partial to their companies' products- that's to be expected, and that's fine with us. But note that you've already prompted a moderator to address this topic.
Hope you take the preceding the way it's intended. FWIW, I'll add the FinishKare system to my decontamination recommendations, albeit with a disclaimer that I haven't actually tried it yet. But I *do* plan to try it.