When we moved into our new house, the shower was dingy. I tried bleach, a handful of cleaners... I would put all my muscle into it using scrubbing sponges, brushes, etc. Nothing seemed to work. I happened upon this product while out and about and figured I'd try it. I used the regular CLR liquid that I've used on my faucet and other areas, but it didn't work. I was hesitant, but due to the low price, I figured I'd give it a try. After a few minutes I was astonished that after 3 years living in this house, my shower was actually bright, white, and sparkly!!!! All the other products I used cost WAY more, left on WAY longer, and had almost no results. Yes, I'll use this instead of other products going forward.