Husky you know my profession; metal and welding is my life's work.
Baking soda should be fine, since it is a very mild alkaline. But I wire brush will get rid of it really well, just take some extra elbow grease.
Sam, beer is extreamly acidic, on a pH scale of 0-14, 0 being pure metal eating acid, 7 being neutral, 14 being an extreme alkaline.. Beer hits about 5.5.. Bad for das hookah, but it tastes so good once it hits the lips..
Edit: Did some research on beer.. lol