How do i use drain out bathroom for maintenance and prevention purposes? Soda crystals - chuck down a good half bag then following with kettles worth of boiling water you may need to repeat or times if it's really bad the washing soda is cheap as chips too -. How do i use drain out bathroom on an extra tough clog or floor drain? Upgrading your insulation help keep the cold out. Citric acid is often using for canning as well as bath bombs, so it’s fair to say its usages.