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

This cleaner works very well for removing hard water stains and mineral buildup. It’s easy to use and the results are noticeable after just one application. It helps restore surfaces and leaves them looking clean and fresh. I like that it works on different areas like sinks, showers, and tiles. Overall, a very effective cleaning product and a great addition to my cleaning supplies.

Found a solution to get deodorant stains out of T-shirts, I put some of this on my shirts with a little baking soda and peroxide through them all into the washing machine and shirts I haven’t worn and had in a box to throw away or now hanging in my closet, and I am wearing them again! I did do some light scrubbing and allow them to soak. When I put them in the washing machine, I did the longest cycle I could with a pre-wash and permanent pro setting. Because I was not sure if the stains came out I hung everything to air dry I even had a couple black bras that were so stained. I was too embarrassed to wear them and they came out perfectly clean and no longer hard and crusty! This was my own test. I figured I was going to throw everything away anyway, so it was worth a shot.

Product really works! I had a fiberglass acrylic hard water stained shower floor that I tried comet, Brillo pads, baking soda, vinegar, boiled water, easy off oven cleaner just about every YouTube hack I could find and nothing removed the stain even after overnight vinegar and oven cleaner attempts. I ended up using a razor but later I found a more gentle paint scraper from Dollar tree that worked. I found this product through a Reddit cleaning suggestion and decided to give it a shot. It arrived in tact and it has a mild fresh scent with the consistency of toothpaste. For my bathroom sink I found an old toothbrush could easily remove the ring with vigorous scrubbing. For the kitchen sink, I found a palm brush that worked best. For the shower floor a stiff bristle brush worked. I originally wanted to only buy one bottle but the two pack was cheaper. Glad I got the extra bottle because it really works. I recommend wearing goggles or glasses to protect your eyes because it does require vigorous scrubbing but works way better than pink stuff which I also bought and tried out.

After reading many product reviews, before I ordered this product, it became apparent, once I tried it, why some people are complaining it puts tiny scratches in their glass or to not use it on Plexiglass (per instructions on bottle). The reason is this calcium and scale remover contains a very fine polishing agent (Similar to the way Ajax or "Soft Scrub" type products work). However, to note the polishing compound in this is very, very fine, much finer than Ajax or Soft scrub type cleaning products. It's almost non register-able when you rub it between your fingers. Think "Toothpaste" type polish level. The consistency of the product is too thick to put in a spray bottle; consistency is similar to "Gogurt" or more liquid type yogurt. Not too thick, not too watery. So, does it work? Yes, it does. We have a stainless steel dish drying rack. Over time, it does get some scale in it from dishes dripping water. We live in California where our local water sources are pretty "hard water", so scale is an issue. Once I put this on the rack you could see it start to dissolve the calcium instantly. Upon using it more like a polishing compound (Rubbing it in well and working it into the steel) it dissolved the scale with ease and did leave a nice finished/polished look. We also used it on the shower doors and on the shower hardware. It does work and it works well. There is no magic to it, like anything else you have to put a little effort into play but the results are well worth it. But, to note, since it does have a fine polishing agent you do want to be careful and not use it on plastic shower doors, or glass you value as "Optical". But, then again, if you have plexiglass shower doors that are that "bad" chances are they're past hurting anyway so I personally wouldn't think it would do them any worse. I don't think I would use this on my auto glass as I wouldn't want the run off or product having any chance of getting on the paint.

Best product I’ve found for taking hard water stains off our shower doors! I used a scrub brush and it took the hard water stains right off. We’ve lived in our house for two years and used so many products. Nothing has worked for us. This stuff is MAGIC! 10/10

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.