I have a frozen pass through pipe in a mobile home bath tub. Can I use rock salt to unfreeze it?

no---use a hair dryer to thaw pipes.I have a frozen pass through pipe in a mobile home bath tub. Can I use rock salt to unfreeze it?
No, applying rock salt to the line will actually make it worse. What you need to do is apply heat with a hair dryer, and once it thaws, let the faucet drip in extreme cold weather to prevent it from freezing again.