I thought snow foam is used to remove the tiny bits of grit ect before you hand wash. This will reduce the chances of the paint being damaged when washing and causing the swirls on the paint. The snow foam on its own doesn't clean the van so don't expect a sparkling clean van with just snow foam.
I've got a Starlight blue van around 15 months old and I've always snow foam before using the 2 bucket wash and I've not got any swirling on my paint.
I've got a Starlight blue van around 15 months old and I've always snow foam before using the 2 bucket wash and I've not got any swirling on my paint.