Smelly sinks are caused by bacteria living and breeding on debris down your plugholes. In kitchens the build up is food particles and grease, in bathrooms it is hair and soap sludge. If you squirt bleach down your sink, it kills the germs but then washes away without removing the debris, so the germs and smells will come right back. Buster’s Plughole and Sink Treatment products have foaming granules that clean the whole pipe, killing germs and removing smells, stains and limescale, leaving your plugholes fresh and fragrant. Use Kitchen Plughole and Sink Treatment or Bathroom Plughole and Sink Treatment as part of your regular cleaning routine to stop Sink Stink!