I am trying to get the plug out of an old cast iron drain and it is stuck solid I have tried WD 40 and it didn't work. Someone else suggested CLR but I wanted to check here first. The last think I need is a broken old cast iron drain leaking sewer gas into the house. Any ideas?
Also there is galvanized pipe I need to connect to and they won't come part either.
Please don't tell me this is a case where I have to cut into the old line and make some kind of a joint. It is very hard to reach.