It's funny, listening to the TRC podcast a few weeks ago, talking about dressings, P&S brand ambassador and trainer Sydni Brae Gwinn mentioned that P&S have too many products in that segment. She is correct in saying that, but I found that quite amusing coming from her as she is such a great voice for the brand and has influenced many new products.
Exploring that further, they have a variety of different product lines, or "collections" -
Renny Doyle Double Black Collection - This is basically their premium or pro-sumer line of products, and the ones that get promoted the most. Think Brake Buster, Swift, Xpress, Bead Maker, Paint Gloss, Dream Maker, Shine All ect.
Off-Road Collection - As the name suggests, these are products that offer additional cleaning strength to deal with mud and dirt. I doubt they are ground-up new products, rather altered versions of existing products. Grouping them in a single line helps them stand out better rather than buried within the wider P&S lineup.
Pro-Series Collection - A lot of the in this line are legacy products, rebranded to group them together. Quite a number of these are only sold to professional high-volume detail shops, There are some true relics of the past here, from Wash-&-Wax soaps, old fashioned glazes and rocks-in-a-bottle compounds, spray waxes and bulk quantity dressings. There are however a few newer products such as Release, the fragrance line, and undressed tire cleaner.
ChemTrol - This is another old lineup primarily aimed at the professional high-volume user. While they can be used on their own, these products have been designed for the P&S dilution system called
ChemTrol. These units will automatically dilute gallon bottles of product to a set ratio, improving time efficiency. There is nothing fancy here, think glass cleaner, heavy duty degreasers, dressings, wheel cleaner. Meguiar's also have something similar, which is called DMS6000 Metering System.
Babe's Boat Care - I've heard the Phillips brothers speak of this in the past, its basically an old fashioned line of trade products. They have been given a refresh in recent years with new labels. Fairly sure not even we get these products in Australia.
I have cherry picked products from each of the above collections, excluding the boat system. For the most part, the best products are found within the Pro Series and Double Black lines.