Well, since we're on the topic of bulk cleaners and dressings, and concentrates, Meg's Detailer Line has a number...as Maxy mentioned, there is the APC which can be diluted to various concentrations, the Glass Cleaner which dilutes 10:1, and the Hyper Dressing (as noted by SpoiledMan while I was typing this) which can be used in various dilutions. I just got some of those three, although the only one I have played with is the Hyper Dressing, which didn't work out that well so far. You can also get the Meg's Last Touch and Final Inspection in gallons. As Maxy said, most of the Pb's products are available in quarts and gallons. I've also gotten Charlie's Soap (both the APC and Laundry Liquid) in gallons.