They're so cheap that you can either take the trouble of regularly cleaning them, or tossing 'em when they turn black and stink and puying a brand new replacement for under $10.
Gandalf pipe's bowl are too large. Size down to savor the flavor of fresh tasting green hits every time that are as close to being free as you might imagine....
Its like a plastic bottle, with a carb, and on the opening, you screw off the lid, place a lit joint inside the lid, screw it back on, and SQUEEEEEEEZE! Like a shotgun!