Here is a guide on how to safely thaw a bathtub drain.

: Use a shop-vac or a bucket to remove any cold water currently sitting in the tub so the hot solution can reach the ice directly.

: Boil a kettle of water and stir in about 1 cup of salt (kosher, table, or sea salt). Slowly pour the mixture down the drain. The salt lowers the freezing point of the ice, helping it melt faster, similar to rock salt on a sidewalk.