3M Fine 9089NA Drywall Sanding Screen, 4 3/16in x 11 1/4 in, 2-Sheet Grit, 2 Count

I read a random article on the internet that said to use fine drywall sanding screens and Barkeepers Friend for hard water stains in the toilet. I am living in a 30yo rental with original fixtures with these stains in every toilet and sink/tub drain. I figured for $5 why not try it since everything else I had tried did nothing. I cut it in 1 strips and tried it with just water to see if it would scratch the porcelain. It did not, and the stains came off in minutes. I didnt even need the Barkeepers Friend. The next time I use it I will wear gloves though, because it does slowly disintegrate when you use it in water and the particles are tiny and could possibly irritate or maybe get into your skin. I have attached a photo of a tub drain and a toilet where the right side has been cleaned with the screen, and the left side was not so you can see the difference.

Fearful of the pointy sharp corners of the mirrors fronting the doors on our medicine cabinet -- one day after suffering a scratched arm -- I did some research on line and read that emery cloth may be used to smooth glass. Who knew! I took a chance and ordered this low-cost package. Right after it arrived, I opened it to expose the coarsest grit and rubbed it on a test corner. After about 10 seconds of this, I had successfully converted the dangerous point into a non-threatening radius corner. Within a minute, I did the same with the three remaining corners. Sign me Perfectly Happy.

Great quality of product and speedy delivery!

Good but a little rough

This completed my sanding and was easy wall came out great. Also still has a lot of life for use.

Our 2 yr old toilet had really bad hard water stains and we tried every product to try to remove it. We finally used these sheets in conjunction with Zep acidic toilet bowl cleaner, about a minute or two scrubbing and NO MORE STAINS! And didnt scratch the porcelain! This is a keeper.

Showed up on time. Correct product. 3M quality

Easy to hold and use. Works great!

I really liked the very fine . It was easy to use between coats of paint and sealer.

I use this and Liquid Bar Keepers Friend to clean hard water stains off my toilet bowl.