I've been using the older version of Optimum Car wash (not ONR) and it does a great job. Duragloss 901 seems to be very popular, as well as the DP soap designed for use in foam guns.
DP extreme foam works nicely. Meg's GC works well.
I think you'll find (at least I did) that the amount of foam generated is more dependant upon the hardness/softness of your water rather than a particular wash soap.
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