Sodium hydroxide (NaOH) doesn't just "clean" your drain. It wages chemical warfare. And if you treat it with respect, it will win.
Carefully pour the hot solution directly down the blocked drain. Do not pour it onto the basin or sink surface, as the extreme heat can crack ceramic or damage enamel finishes. Pour slowly to avoid splashing. using caustic soda to unblock drain
Let the solution sit in the drain for approximately . During this time, the chemical reaction will break down the blockage. Sodium hydroxide (NaOH) doesn't just "clean" your drain