Took 2 treatments but drain is totally clean!
I found this on a recommendation webpage from bob villa. Although it doesn't recommend it, I followed each of my 2 treatments with boiling water. I shined a flashlight down my drains before and after. My kitchen sink drains are totally clear. My bathroom drain is still a bit cruddy because of old pipes in my rented apartment, but far better. This stuff is excellent!
Rating: 5 stars