Oxalic Acid (8 lbs) 99.6% Pure - Metal & Wood Cleaning and Bleaching, Rust Removal (C2H2O4) - HDPE Container w/Resealable Child Resistant Cap

Great for cleaning wood. This is first time I used this product. I will be using again. Restored wooden deck great.

I had a lot of rust stains from a cheap metal dog enclosure that was on my patio. This product was amazing at how well it removed all the rust. It was easy to use and I quickly saw results.

Product came so compressed, I wasn’t sure it was 8lbs. After uncompressing , I followed the instructions, 1 cup to 1 gal of warm water.Product worked as expected, I have been using this product from another source for years and but this brand is better and at a better price! I have only been using it to remove rust stains from well water which is my irrigation water. But will try out on other uses as well . Recommend this company and product.

This product is DANGEROUS, so be careful. If you took the lid off and put your nose up to smell, you will likely be heading to the hospital. I used it for cleaning rust off my pavers her in Florida. Best way to use I found was to put 2 gallons of warm water into a 5-gallon pail. Then add 2 cups of the product. Mix with broom and then apply with same broom. The liquid is dangerous also, it burns the skin on contact, and don't dare get in your eyes. Then let sit for 10 minutes or so. Then hose or power wash off. The pavers look new and no more rust.

Cleaned inground pool of stains. Worked great

After sanding to remove water rings from an oak table, I was left with a 4" dia dark black ring stain (about 1/4" wide) that penetrated the grain. Hydrogen Peroxide did not make a dent. I applied this product, dissolved in hot water, to paper towels placed in the area of the ring and left to soak for a couple hours. That effort removed 80%. Next I wet the surface with the same mixture and sprinkled some dry oxalic crystals directly to the liquid over the ring and following grain lines crossing over the ring (to distract from potential over-bleaching in the shape of the ring). After a couple more hours, I rinsed with cold water. After the water dried, the ring completely disappeared. It reappeared faintly during staining, but 99% disappeared again (maybe even over-bleached in some areas?) after stain & subsequent poly coats dried.Now I'm just sad I did not take a before picture. I really did not think the ring was removable and am very happy with the result (photo).

It is not as affective as I thought the product would be!

This stuff is top tier if you know what you’re doing with it.