Wow!  This works!
This really works!  I had a clog that was about 3.5 feet back from the sink elbow.  I first tried a snake.  In the past the snake worked but this time nothing came out.  I then tried 2 bottles of green g...  Leaving green in for 12 hours.  I still had the clog.  I then tried Professor Amos.  I poured Professor Amos into my bathroom sink drain and turned on the cold water to push it back to the clog.  In less than 10 minutes the clog was gone.  I could hardly believe it.  I then left the water on for 15 minutes.  -No clog.  Next I left the water on and poured 4 gallons of hot water.  -Still no clog.  This product works!
Rating: 5 stars