Bio Clean: Eco Friendly Hard Water Stain Remover (40oz Large). Pack of 2

works great!

I am so grateful for this product. I use it on the outside of glass windows, the glass shower doors and glass cooktop.

It's great, it works.

Works great but if you leave it on too long it stains the surface.

It works, but it requires some SERIOUS effort.My project was the shower door, with years of buildup. Lots of buildup.I tried first using a magic eraser-type pad by hand and was able to work a small area. It removed some (but very little) of the hard water staining, but nothing that looked clear or anything like new. So I relented and bought a DeWalt DWP849X rotary polisher plus some assorted 7 inch pads of various foam densities. I chose the medium of the 5 densities and used that with this cleaner/compound.That combination worked. It still takes time and lots of effort. Depending on your door, you'll need someone to help support the door while you work. You're not applying heavy pressure to the door - more like just solid contact consistently. The polisher slings the compound everywhere even at low speeds, so be sure to have things covered that are nearby. You need to go slow and methodically, and cover every square inch, but it came out clear. You also need to understand the basics of polishing - that helps you understand how everything is working or what adjustments you need to make to material or technique.It amazed me that it got off the hard water staining especially at the bottom of the door where the buildup is the greatest. But it did.

I've tried every trick from CLR to baking soda, vinegar, all these lil hacks u see online. Was very skeptical when I saw this but said what the heck....OH MY GOSH...this stuff worked! My glass shower doors and panels where so spotted with hard water you couldn't see thru. Used a buffer on my drill and bam...clear and see thru! It's amazing!!

I like this stuff because it does actually help with the hard water stains on my glass shower doors. However, it does not help much for hard water stain buildup. It's basically best at preventing it, not clearing it up.Being "eco-friendly" you would think it was safe. The only warning on the bottle is not to get it in your eye. However, it absolutely destroys my hands. This is 3 days later and it's still peeling off. Makes me wonder how "eco-friendly" and "nontoxic" it actually is.

It works!