Cover or plug the drain immediately and let the mixture sit for about 15 minutes. Next, boil some water in a kettle or saucepan and pour the boiling water down the drain. A solution of baking soda and vinegar can also be used to clean stains and mineral deposits off of the area around the outside of your drainCover or plug the drain immediately and let the mixture sit for about 15 minutes. Next, boil some water in a kettle or saucepan and pour the boiling water down the drain. A solution of baking soda and vinegar can also be used to clean stains and mineral deposits off of the area around the outside of your drainCover or plug the drain immediately and let the mixture sit for about 15 minutes. Next, boil some water in a kettle or saucepan and pour the boiling water down the drain. A solution of baking soda and vinegar can also be used to clean stains and mineral deposits off of the area around the outside of your drain