CLRPRO Calcium, Lime & Rust Remover, 32 oz. Spray Bottle, Pack of 2, Quickly Removes Calcium, Lime, Hard Water Deposits and Surface Rust StainsU.S. EPA Safer Choice

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.

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.

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 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.

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.

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.

My son's shower it hideous. No idea how he manages that much build-up.This stuff eats through it better than anything I've tried before.Bonus, it doesn't wear out your trigger finger spaying it. Not sure how they did that...or how the others made it such a pain.With other brands, I spray the area, scrub, rinse, repeat, often several times. With this, one spray is enough for most, sometimes a second for really thick areas. Never really have to scrub.

We bought a house in Florida. There were terrible calcium deposits on the granite counter tops in the bathrooms and fixtures. Regular CLR didn't work but the industrial strength worked great! It did take 2 days to get the deposits off completely. Very happy with the product!