Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
The front nozzle controls the way the foam comes out, so either in a stream like a normal hose would or a narrow opening to give a wide angle type spray.
As others have said though, have a play around with what suits you. I can't remember which of the +/- does what as i just do it without thinking of it sort of thing.