Re: cleaning a hookah
I clean my hookah between each use....so I use the normal stem brush and straight H2O
When I see that I have something built up in the way of corrosion, I take my rifle cleaning rod with corresponding brass bristle bore brush to it and basically resurface the inside of the stem. Shiny.
Most Egyptians will take a .45 caliber brush... my Syrians take a .38 cal or .40 cal.