Arrived onsite to customer having sink drain not draining. Gave pricing for drain cleaning through p trap. Customer accepted pricing. Removed paraphrase and began by power cleaning with 100 machine. Reached blockage approximately 20 feet in. Pushed blocked to approximately 40 foot where it appeared the blockage was broke up. Re did sink drain and checked for leaks and drainage. No leaks present. Drainage was working for approximately 30 minutes of drainage