The general consensus now, is that what used to be considered a "strip wash" of using Dawn, to remove your old sealant before applying a new one, wasn't actually removing anything. When you "stripped" with Dawn, and got no beading, you weren't actually "stripping" down to a virgin surface, you were adding a layer of polymer gunk to the top of your existing sealant (the purpose of the said "polymer gunk" in Dawn is to allow the water to "sheet" off of your dishes so you don't get water spots).
So the countless people around our world who used this process weren't putting their new sealant directly on the paint, they were putting it on top of Dawn surfactants, which were on top of their previous LSP...and no one was any the wiser.