ContentsDamaged PipesStep 1 Try The PlungerHow To Unclog A Sink DrainVinegar And Baking SodaFill the sink bowl, tub, or bathe pan with a number of inches of water. This will allow the cup of the plunger to form a good seal. Also generally known as caustic soda, you should defend yourself when working with this as a result of it could burn your por