I'm afraid to try it but it might work. Whether your kitchen sink is holding water or your tub won't drain after another at-home haircut, there's an easy solution to those plumbing woes that doesn't involve a trip to the store. "Coffee grounds can be mixed with dish soap and boiling water to unclog drains," says Alex Azoury, founder and CEO of Home Grounds. Azoury recommends mixing the grounds with soap and adding the mixture into your drain, following it up with a lengthy pour of boiling water, the combination of which will break up whatever's clogging your pipes. Source: https://bestlifeonline.com/easy-home-hacks/