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I've used the Meguiars snow foam with the lance bottle and its brilliant. Not sure if you can use it through the bottle on the pressure washer but sure someone like RS MATT can answer that. Good stuff and it seems to work well.
You need a snow foam lance that attaches to you pressure washer... I run all year round on cherry snow foam it's ph neutral so it's bang on for not taking the glacé off.
If you struggle drop me a pm and I will go into abit more detail