To clear clogged drains -- Pour a cup baking soda, cup salt and 1 cup of vinegar into the drain (it will bubble and foam up). While vinegar mixture foams, fill a kettle with water and bring to a boil. Pour boiling water in drain.
DIY clean drain: Pour cup baking soda and then cup of vinegar. Cover up the drain during the crazy chemical reaction. Wait 15 mins and pour a pot of boiling water. It totally clears up the clogged drain caused by my long hair.