I've got a very old tub faucet that has a galvanized pipe connection to the spout. The pipe has started to rust out. I plan to replace it with a copper pipe, but first I have to remove the old pipe. My only hesitation is that the pipe seems to have been installed with some kind of "sealant". I don't know if I need to do something special -- e.g., heat the pipe first -- before I use a pipe wrench to unscrew it from the valve body.
I've included a pic, and that creamy stuff sitting on top of 90 degree elbow is the "sealant" I've mentioned above. (Sorry about the horizontal display -- my viewer shows it vertical ...)
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