Don't try to hammer or aggressively snake through ice; you’ll likely just crack the frozen (and brittle) pipe. The "Salt and Fizz" Method (Internal Thawing)
If you have a crawlspace or basement, you may actually see frost on the outside of the pipes. Safety First: The Big "Don'ts" frozen bathtub drain
2-3 gallons of hot water (boiling for metal, very hot for PVC) 3 Step Process On How To Unclog A Frozen Drain | Blog Don't try to hammer or aggressively snake through
If you notice your tub isn't draining during a cold snap, follow these steps to thaw it without damaging your plumbing. 1. Clear the Standing Water frozen bathtub drain
(Aerosol based)