12oz Oxalic Acid Wood Bleach, presentation may vary.

Counter was damaged by soap sitting on it for a month or so in our vacation condo. Black spots didn’t go away even after sanding finish off, but this took care of it quickly and easily.

I actually ended up buying this locally because I didn't want to wait. I used it to bleach out some black marks on a midcentury danish dresser top and it worked perfectly. I applied it lightly, waited 10-15 minutes to wipe off excess and spray water on it to remove the bleach. Wiped down with dry rag and repeated the process. Probably could have done it a 3rd time, but I was happy with my result. After it dried completely overnight, I applied Daly's seafin teak oil--2 coats following their directions.

This didn’t work as well as I had hoped. I was attempting to lighten some drawer faces I had sanded to raw wood. They are quite ‘orange’ in their undertone and I wanted to make them lighter before sealing them. It helped a small amount and although I repeated the process 3 times, I just did not notice a huge difference. That being said, it was very easy to understand the directions and after reading about the process of bleaching wood, I realize it’s not a magic bullet. I think I might have chosen poorly, but the bag does say ‘wood bleach’ so I expected a little more. If you use this, DO follow the directions and use the safety goggles and heavy gloves. It makes a difference- especially if you drop the liquid once it’s mixed together. As for cleaning, it has been useful in getting some stains off our pool coping. It is also a good value and a quart goes a long way.

As advertised the product lightened the stain from the red oak flooring after I sanded it. But the instructions say to counter act the acid with a base like baking soda. That did the opposite and turned the wood black like charcoal. I had to sand the wood again and the clear coat reacted to the residual chemicals and turned white where I had applied. I'm going to assume this is all my fault but I'm cautioning you to test this on something first before applying it to a refinished hardwood floor.

First, the product arrived quickly and was packaged well. I got it on Sunday with Amazon Prime. I purchased this because I am moving out of an apartment and my dog had urinated on the 100 year old hardwood floor. It had pooled under my dresser and left a black spot about 12" x 18". To start, the stain was as dark as ink. To start, I cleaned the area very well. Then dried it thoroughly. Then, I sanded all the varnish away with a course grain sandpaper. I mixed the wood bleach solution, put it in a spray bottle and sprayed the effected area. And... nothing. I let it sit until it dried, then rinsed it away. Still nothing. For the next day, every time I went by, I applied another application. Probably five times. Still no change. Finally, I decided that maybe I didn't get all the varnish off, so I bought a varnish stripper and used that. I then applied another treatment and saw a small amount of progress. Not much though. Again, every time I went by, I added more. Rinsing away the old layer each time. On the third day, I bought a hair dryer. I figured at this point, the floor was probably pretty saturated, yet as good as it's going to get. I rinsed away the product six times, using fresh water each time, then dried it with the blow dryer. As the area dried, it got white from the wood bleach residue. So I repeated. Water. Water. Water. Dryer. Water. Water. Water. Dryer. Over and over. Literally 50 times. Each time, the area got a little bit lighter. Evntually, the lightening stopped. But I just couldn't get that residue out. I used vinegar, then rubbing alcohol. Then I soaked paper towels in a mixture of the two and let it sit on the area for about 20 minutes. Then I scrubbed with the soaked towels. Water, water, water. Dryer. Still white residue! Then I bought a deck brush and scrubbed with vinegar, then water. Over and over. Dryer. Still white. This whole rinsing process took 4 hours of straight working on it. Finally I dried it for about 10 minutes and decided that the residue was there forever. The last vain attempt was fairly helpful. I sprayed it down with furniture polish, let it sit a few minutes, wiped it down. Dryer. It was much better! Still had some residue. But I was done at this point. I make sure it was really dry, then sanded again. Then brushed it all away and stained. The result isn't perfect, but isn't terrible. If this wasn't so much work, I'd give it 5 stars. While it's not perfect, this is the only product out there that has any effect on water stains on wood. The alternative was to replace the planks. However, my total time on this project was 9 hours. 2 the first day, 3 the second, 4 the third. And that's straight manual labor time. It would have been faster to replace the wood. And likely cheaper, as I spent $10 on varnish remover, $5 on a hard bristle brush, $3 on gloves, $25 on a hair dryer, plus the cost of the wood bleach. But I did work, sort of. So if this is the only option, definitely buy it! But first, consider what your time is worth.

Worked well.

Works beautifully and didn’t leave a trace of where the ring or bleach had been. I had a big circle black ring on my outdoor bench and this took it off like it had never been there. Easy to use and no smell.

I followed the directions and applied bleach to four different species of wood and the product had no effect. Even doubled the dose and still no results.

It works pretty well but you will need to apply it multiple times, depending on how much lightening you want. Also, make absolutely sure you use this in a well ventilated area. This is a fairly potent acid and I started coughing just from the fumes as I was mixing it. I guess that's why it's so hard to open. Best option is to use a flat table knife or screwdriver and work your away carefully all around the lid.

I purchased this product to remove water stains on an old gunstock. I was expecting fast significant results as per watched on You Tube.... I wasted a lot of time and effort applying, re-applying and re-applying with no apparent results. This product does not work at all even at high concentrations.

Well just arrived home to find my purchase in a tiny box. It didn't come in the tub like in the pictures and so not premixed nor a bucket to mix it in, just a packet. Don't know if product works just disappointed not in the tub form. Will come back once I see how it actually works.

Definitely need good ventilation and don’t skip the wash down to neutralize. Will remove most stains and can be used to bleach colour a bit

Only 3 coats to see a improvement