Best Drain Cleaner for Shower Bathroom Drain Cleaner Sewer Pipe Unblocker is a perennial bestseller because it's our much-loved, easy-to-use drain cleaner that works. This shower drain cleaner features a unique detergent formula that removes hair, soap scum, and greasy residue with just one application. Plus, it’s safe to use on most types of faucets and connections, and it won’t damage the finish