They definitely do work, but like Cassie mentioned if they are extremely pushy at this point a stronger message might be needed at first to gain some respect from them. Although I would say it wouldn't hurt to try the squirt bottle first, or if you need a little more extreme turn the hose on...
I have just two Nigerian Dwarf wethers and they definitely become monsters with food! If they can't be kept separate, I highly recommend tying them up when you're ready to milk so they learn to wait patiently for their turn. I can't do anything to one without the other up in our faces and they...