Product review (5 stars): REALLY WORKS!
My humidifier had such bad hard water built up it was gross! No matter what I tried I could not get the hard water off. I decided to try Boinaire Humidifier Cleaner and following the instructions to the tee, The hard water just melted away! I was amazed! I wish I took before and after pictures because it was just a complete difference! This works wonders!