Autobrite magifoam is the best snow foam I've used you can get it on really thick, leave it to dwell for 10-20 minutes if not sunny and then rinse off, its so good that sometimes that is all you need and the car is spotless and clean, perfect for preventing swirls.
Sounds like a plan. I'll pick some up when i'm done with the Bilt Hamber, which, at a 1:1 dilution, will be about a month's time