For the last couple of years I have used DoDo Juice shampoos. Sour Power on my Golf(s), because it is supposed to contain Carnauba, and Born to be Mild on my S2000. Both produced very satisfactory results, with a good lather.
Now that winter is looming and I've sold the S2000, I'm going to experiment with Gyeon Bathe and Gyeon Wet Coat, simply to make washing less of a faff in bad weather. I haven't used either of them yet, but I'll report back.