CLR PRO Calcium, Lime & Rust Remover, 32 oz. Spray Bottle, Pack of 2, Quickly Removes Calcium, Lime, Hard Water Deposits and Surface Rust Stains

Removes soap scum and hardwater mineral buildup from stone easily! Spray, wait 5 minutes, swirl around using scrubby side of sponge and rinse! Rinsing takes a bit of time to wash away all of the thick sludge which becomes loosened. I noticed if I didn't wait for the mist to settle it irritated my throat and made me cough. This is the only product I have found which works on the rough surface of stone shower walls surpassing even straight ammonia and the black and decker circular scrub brush.

Pleasant smell and it does the job. Best product I've ever used to clean off tough calcium buildup. We purchased a used glazed pottery birdbath that was covered with layer upon layer of ignored calcium buildup. We wet the birdbath and then sprayed the solution on heavily and let it set for 30-minutes. We then took pumice sticks and started to scrub the buildup. On the lighter coated areas the buildup came off easily. the heavier coated areas took much longer to work. After two hours and six pumice sticks later, the birdbath looked brand new. I won't hesitate to buy more when needed.

Soaked calcium deposit around drain in sink for hours. Didn't remove a thing. UPDATED REVIEW: I sprayed the area around the drain several times a day for about a week. Just let the CLR sit. Poked at it with an orange stick once in awhile. All deposit is gone. So...it does work, just takes time.

I live in a rental house and the toilets weren't filthy, they were freshly cleaned when I moved in but years of lime and calcium build up had left rings at the water line inside the bowl and a line down into the bowl where the water came in to fill the toilet bowl. I followed the instructions and with a little bit of scrubbing (not it much) the toilet bowls look good as new. However, for me, it was a hassle to have to turn the water off and drain the bowl. I was concerned that the knobs being so old they might break off in my hand and I didn't know where the main line to the house was. I didn't think ahead. The inside parts weren't what I was had seen before. But good old YouTube helped me. The owner was surprised but happy I managed this. They look so good, not like they are never cleaned.

I was unaware that this is basically just a bottle of acid. I purchased it thinking to use it to clean off scale that has developed on the bottom of all our sink fixtures. All of which are the dark bronze style which you cannot use this on. I got reading the use and cautions and whatnot and find it is some pretty nasty stuff and will mess up a great deal of various surfaces, cloths, sponges and so on. I would imagine that much of it is to cover their own hiney when you use it on something you weren't supposed to, or unaware of what it will do to a towel and so on. I am sure I will find some use case for it, perhaps to clean the showers as I read in many other users reviews, but a TOTAL fail on my own part for what it was purchased to do with. Pro tip that I should have heeded would be to read about a product and inform yourself before just consider what it is marketed to do without knowing all the details.

Absolutely love this project

I struggle with hard water stains on my shower doors and have tried numerous products. The industrial strength works much better than anything else I've used. It loosened the caked on hard water to scrub off although in some spots it took more than one application. Each bottle was in a plastic bag to reduce leakage. I highly recommend.

We had a shower with porcelain tiles that had accumulated a lot of mineral buildup from the past owners. I really didn’t expect this product to work very well based upon past experience with other similar products. I was wrong - this product worked very well - you have to keep it on a while - wetting a rag and sticking it to the tile worked well for us. We didn’t have to scrub and scrape like I expected and the tile is no longer yellow from the build up. My SO is sad because she thought she would get a new shower on the deal - no need now since this one looks so good!