I use a nilfisk, with an old clean your car lance.
What thread you on about Tom? On the bottle? My main bit if the Lance is brass? Only plastic bit it's the outer nozzle case, bottle, and the screw.
I've used Bilthamber foam for years and been pleased. Recently fancied a change, and got Valet Pro pH neutral.
One of the best around according to detailing world.
General consensus is the higher prices ones do no better job than Bilthamber and Valet Pro. Which are much cheaper.
Foaming is a Pre wash, so you generally wash the car properly after. It's aim is to remove as much debris as possible before you touch the car.
I did look into the autobrite, as was going to buy a new lance too. My adapter was for karcher.
But clean your car threw me in an adapter and extension bar with my order, so saved a load.
Fahad try stopping and cleaning it. They gunk up inside. Especially if you dont clean them after use.