Magical!
I have a rain shower with a tempered glass divide 5'x4' that has had hard water stains and calcium build-up.  I've used several products over the past 10 years, ranging from vinegar to muriatic acid and everything in between.  As I'm preparing my house for a showing, I was desperate to find a product to clean the water stains.  This product is absolutely amazing.  It's easy to use and most of all, it actually works.  My shower glass looks like new.  I 100% will use this product exclusively from now on.  It worked magically as well on my nickeled shower faucets and stainless steel sink.  Finally a product that works - such a relief.
Rating: 5 stars