The UK's No 1 Selling Drain Brand*, Mr Muscle Biodegradable Drain Unclogger is a newly formulated drain unblocker and cleaner that clears bathroom sink, shower and bathtub clogs with the new biodegradable formula that unclogs your slow drains by bringing the Biodegradable Muscle.Instead of trying multiple home remedies for clogged drains, use Mr Muscle Biodegradable Drain Unclogger once to solve your slow drain – plus, there are three treatments per bottle.Using innovative drain unblocking technology, Mr Muscle’s new biodegradable formula delivers the power to unclog bathroom drains in just 5 hours. Use it at night, let it work its magic and wake up to freely flowing drains. Mr Muscle Biodegradable Drain Unblocker is non-corrosive to pipes and leaves no harsh bleach smell. * Bottle body made with 50% post-consumer recycled content.** Filled at a facility that purchases 100% renewable electricity from wind.