Needs the power drill brush to work —but it DOES WORK!!
I am writing a review because I read about 59 reviews before I bought this product and I want to help someone else out.  We have a bathroom with a glass shower door and wall which hasn’t been properly cleaned for 17 years.  We washed it but never concerned ourselves with getting rid of the hard water stains.  Finally during COVID-19 I have had tons of extra time and got a bee in my bonnet that I needed to get that shower looking fresh and new. I started with CLR, then Lime-a-way.  Each evening for about 2 weeks I spent about 20-30 min of hard scrubbing on that glass shower every day to try to make some effort. Most of the buildup was gone after all that scrubbing,  but the etched in hard water stains remained, no matter what I did, no matter how hard I scrubbed. Next I moved onto a razor blade and scraped and scraped but it made absolutely no difference.  I got a ceramic oven cleaner and tried that. Nothing would work.  I was scared to buy this product because some reviews gave it low marks. Also, I wanted to get the set with the power drill brush, but several people said that it left scratches on their glass.  So I finally gave in and bought a bottle of this product, and I also bought a WHITE power drill brush (not the stiffer yellow one) and tested it out on a small spot in the shower on the glass.  I had to drill at high speed for a few minutes, but afterwords I was flabbergasted! It actually worked! All the etched in hard water stains were gone in that spot! I couldn’t believe it!  It did take 3-4 attempts to completely remove all the hard water etching from my glass.  And I had to rinse with tons of water, and then I used windex to remove any residue.  My glass looks brand new! It is amazing!  I must say that there is a very slight  (and hard to notice) clouding of the glass now, but the glass looks so clean and new that it is like we just bought the house! The slight (very very slight) clouding is much preferable to the hard water etched-in hard water stains.  It looks so amazing now!!!  I gave this 4 out of 5 stars because it was so expensive!! And because of the very slight clouding.  But I honestly don’t know if it is the product or just the power drill brush that made the difference, but the combination of the two did the trick! I wish I would have used this first rather than getting all the chemical burns on my hands from the lime-a-way that I tried in the beginning!!!
Rating: 4 stars