Product review (4 stars): The first descaler and cleaner that truly works for me
This cleaner/descaler really works! I have used mineral deposit removers in the past but they were not effective. My humidifier had been used for years and there was a buildup of mineral deposits: calcium and I guess some iron from the old water pipes in new York city. Brushing the liquid on with a plastic brush (old toothbrush) and letting the evaporator parts soak in diluted liquid cleaned the parts in 15 minutes. Be careful with granite counter tops. I did the cleaning in a stainless steel sink and a plastic tub and rinsed thoroughly after that. Humidifier looks like new and works even better.

Why not five stars? The product worked better than I expected but I reserve five stars for things I am truly passionate about.