CLR PROCalcium, Lime & Rust RemoverU.S. EPA Safer Choice

Word of advise, if you are using this to descale an old toilet, this helps. Do this right before you go to bed at night or you will not be home to use the toilet. Or you have another toilet to use for about 8 hrs. If for some reason you're old and your hand strength cannot shut off the water to the toilet, take a bucket of water and pour it into the bowl. It will make the bowl flush [meanwhile the tank still has its water for the next flush using the handle]. Take a sponge, towel, disposable cup or shop vac to get as much water out of the bottom of the bowl as possible. Then slowly dump in the contents of the CLR bottle, put down the toilet covers, put on the exhaust fan, close the door. 8 ish hours later, place an old towel or newspaper between the bowl and the seat and cover [in the event of splashing]. Flush. You will be surprised. And as the toilet flushed and before it starts to fill up again, scrub the calcium that is still on the bowl. you will be amazed at how it comes off. This probably saved me a few hundred dollars and has extended the life of my very old toilet. I was prepared for fumes, and danger with a face mask, gloves, etc. I did not need it. But poor slowly. That is the key. I have tried Iron Out, Lime A Way, Pumice stones, even a scraper to no avail. This stuff works.

sometimes you have metal parts that have high carbon build up... put the parts ina little bin or M&M canister, add this and the metal parts.. 12 hours later your parts are clean!

I Tried this product, among a couple of other products, for heavy buildup in 2 toilets. I followed the directions for every product. Nothing worked for the heavy buildup, so, I decided to use my electric pressure washer, which I occasionally use to wash down my shower. It removed all the limescale with no problem. I used the CLR and a brush to clean the area underneath my toilet bowl, which the washer wand could not get to, and it worked fine. Finally, I used some baking soda with vinegar to give the toilets a final cleaning. It took me about 15 minutes to finish the job.

I purchased this to remove a limes ale skin from the tub. Sprayed the skin waited an hour and scrubbed with a brush. It did not remove the stain. I think it's worse. Waste of money.

not for toilet tartar. Does not work at all