I damaged the finish on a 30 year old screw on type bathtub spout, and would like too replace it.
I tried turning it by hand with no luck, I think it's corroded (we have hard water).
Any helpful hints on how I can get it off?
From experience--if the pipe on which the spout is mounted is galvanized iron, it should come off. The spout will be useless, but it should come off. There is a chance the iron pipe will unscrew from the fitting in the wall. That is not a problem, as you can buy another piece of pipe and replace it by simply screwing it into the fitting(with appropriate sealant.)
If the pipe is copper, there is a chance the copper pipe can be damaged. That means removing/repairing the copper pipe, which can be difficult.