Didn't unblock sink at all,if anything is was more blocked after applications, even when left for hours! Also, a boiler service check for your home is crucial because it can reduce your energy bills by up to % and save you money. It's so great to be able to keep drains clear without toxins! Finding and stopping leaks is a plumber’s specialty, so if you notice one, give your plumber a call. Set up an appointment with one of our technicians! call today!.