Let the mixture sit for at least . For stubborn or slow drains, you can let it sit for up to an hour. During this time, the reaction is breaking down the bonds holding the grime together.
After the waiting period, boil another full kettle of water. Remove the drain cover and pour the water down the drain in a steady, forceful stream. This flushes away the loosened debris and the remaining baking soda residue. how to unclog shower drain with vinegar and baking soda