There’s a substantial difference between testing and using. A single isolated use of a product does not necessarily provide grounds for any kind of qualification.
Please. You are reaching without any information about me, my background, or the commercial product testing I have done. In fact, there are many experienced chemists on this forum, some more experienced with cleaning chemistry than me, but they stay quiet about their experience.
Did I boost up any specific product, other than a brief mention of Boat Zope, with which I have no relationship? It's just a good product I like, though most deck cleaners work well if they soak. But by no stretch is it the only product needed to clean a boat. In general you will need a surfactant type (bird crap and such), something acid (black stains, ICW smile, rust), something with anti-mildew and algae properties (both wet-and-forget and borax were mentioned), something mildly abrasive, something with bleaching properties (borax, bleach, oxiclean, though each has different strengths), a solvent (fender marks, adhesive residue), and something for soft vinyl. It would be easy to write a chapter about each. There is no single silver bullet, nor would it be a good thing, based on what we know about chemistry.
And arn't we just having a fun water cooler conversation? By now it should be clear that many products work, and that important lesson is to match the chemistry and method to the soil type and surface compatibility. Most of this high school chemistry. It's not nearly so much a regional matter as identifying what the dirt is and selecting chemistry that will remove it without damage to the surface.