Use drain out bathroom drain cleaner as needed to unclog bathroom drains for preventative drain maintenance, add / of the bottle to the drain weekly. John baethke & son plumbing has completed more than , drain, pipe, sewer, and water heater jobs and we're ready to help you next! Let it stand for minutes (longer does not work any better). Do you love stahl’s excellent service? We guarantee all our work, no matter how big or small. Other elements.