Originally Posted by TheHookahStore
Try soaking it in a bathtub full of hot water for a while, then run your brush thru it. Works well for me.
When it gets really nasty, I pour some baking soda in followed by some lemon juice. It foams a bit but it does a great job of getting rid of all that nasty tar crap. It also doesn't leave behind any unwanted flavors. Just be sure you rinse well after.
yeah i usually only get around to a heavy scub down about once a month...but when that day comes around i usually pull out the baking soda and lemon juice ^_^