If you try the hair dryer for an hour and nothing happens, or if you notice water backing up into other drains (like the toilet or sink), stop. You may have a frozen main line, not just a tub trap. That is a job for a professional with a steam machine.
Try these methods instead:
If the blockage is deep, using a wet-dry vacuum to suck the melting slush out can be more effective than trying to push it down. bathtub drain freezing
If you leave the house and the water continues to drip, that backed-up water can freeze in the tub itself. Ice expands. Expanding ice can crack porcelain or fiberglass. Suddenly, you aren't just dealing with a frozen drain; you are dealing with a cracked tub and a leak into the ceiling below. If you try the hair dryer for an
To prevent your bathtub drain from freezing: Try these methods instead: If the blockage is