I'm actually starting to learn a bit about all this detailing malarky now, and the sceince of it is quite interesting although I still dont really enjoy doing it much so leave it to the mrs instead, she's weird enough to actually enjoy it
There was a couple of threads on this the other day
Lance thread:
https://passionford.com/forum/concou...oam-lance.html
snow foam thread:
https://passionford.com/forum/genera...snow-foam.html
older snow foam thread:
https://passionford.com/forum/genera...snow-foam.html
It works really well, stays on for ages and gives the detergent time to break the dirt down, and if you wish to agitate it manually as well with a microfibre mitt or whatever its really easy to do so (best to only do that after its had one rince at least in case of particles you might scratch the paint with).
You need the lance AND the product, you cant just use the product on its own.