Ecoxall Oxalic Acid Fine Powder, 99% Pure, 1 lb (16 oz), Pack of 1

Worked great on a a really nice shirt that I laundered at least 20 times, and put in the dryer, because I kept on using it. I’d wear a magnetic name badge over it to hide the strain which was also the culprit!

Works wonders on quartz!!!!! Be careful because if it sits too ling it will cause yellow staining! Be careful as to NOT INHALE this fine powder! Where goggles and mask and face shield! Just be safe

I used the Oxalic acid to remove stains from my hardwood floor after sanding out the top layer of stain. It helped lighten and remove many of the stains but did not work quite as advertised. I would buy this product again and it worked well, but not perfectly. Be careful when using as it is clearly an acid.

This stuff is legit. Removed my rusty irrigation water stains in 10 minutes. Diluted 1 lb per gallon, applied to wet pavers and driveway concrete, let sit 10 minutes and rinsed

I used this product to remove some dark stained areas on a dresser. I purchased the dresser which is a light blond wood, possibly birch; and it was sold as finished. Someone had waxed it but there were still some dark areas on it, perhaps from stain that wasn't completely removed. I sanded with a fine 320 grit sanding disk and followed up with 0000 steel wool, but the stains were still visible in some sections. Since I was refinishing this Mid-Century piece, I wasn't worried about damaging any patina. There was none, so I had no problem with light sanding. The Oxalic Acid did a great job of removing some of the darker stains which remained, followed by some other light sanding. I was very happy with the ease of use of this problem. Not much odor, but I did this outside. Even inside I don't believe it has any odor. I did notice when removing the crystals with a brush after the Oxalic dried, it does produce some dust this was slightly irritating when I brushed it off so I did put on a mask. I did finish with a baking soda/water wash to neutralize the acid before my final lacquer finish. It's a good product and I'll use it again if need be. I wasn't planning to write a review so there are no before and after photos.

This cleaned that toilet in 20 minutes, I didn't have much time left as I was getting off work, so I had to rush in see just how well this,was going to work? And it cleaned so well , in such a short amount of time added in warm water to the mixture and made a paste and blotted it on to the stain.

Well packaged and arrived early.

Oxalic acid is an amazing rust remover. Mix 1/4 cup of the powder in a quart of warm water. Mix it until the powder is totally dissolved. Dip a rag in the liquid acid (use gloves) and lay it on the surface that is rusted. 30 minutes later, the rust is gone.