Concrete Stain Remover

Our concrete pavers were stained with oil from an A/C compressor coil leak 3 years ago. We just replaced the entire system, and the new outdoor compressor is an upright front discharge unit with a much more compact footprint than the old top discharge unit it replaced. The stain that was under the old unit was suddenly really visible, and I tried all the "home" remedies first including sand, laundry detergent, toilet bowl cleaner, power-washing -- and none of them really did much to remove or even visibly reduce the deeply set stain.Overnight Stain Remover has almost removed the stain after two applications. Each time it looks really good right after use, but then the stain comes back. The first time it looked great for about a day, and then the stain started to come back -- although fainter and smaller than before application. The second application again removed the stain, and then after about a week some traces of the staining came back faintly on an even smaller area. Hoping a third application will eliminate the last traces permanently. But even if not, it's faint enough the casual observer probably wouldn't notice it -- and it's so much better than I ever expected it to be given how long the oil had soaked into the pavers. Wish I had tried this first -- would have saved a lot of time and effort.TIP -- works best when concrete it cool -- do it first thing in the morning and keep the hot sun off it (shade with something) if possible.Update: A workman's truck dripped oil on our driveway. One application of some of the leftover Overnight Stain Remover took care of it. Good product to keep on hand for oil spills in the garage or driveway.

Amazed how well this worked. First time it didn’t work at all, I read directions about not adding to hot surface and ignored that. The stain didn’t go anywhere. I decided well I can’t throw away a full bottle so let’s try again. Added to 2 stains around 7:00 and lt sit. I removed it 2 days letter from laziness and the stains are completely gone.

Works well. Wish I would have taken before and after photos.One thing I do not like about this product is after you sweep it away it still leaves some dried up white powder behind. All of our vehicles are covered in white dust and when it rains it's more obvious. I power washed my driveway to try and get rid of everything but it still looks like some of the product is stuck or embedded in the driveway. It did work to lighten the stain but there is a crack in the concrete where the stain was and the crack is still stained.

Ok...Im a skeptic. I had a very large oil spot in my drive that needed cleaning up. I had hoped that this would just lessen the appearance but had anticipated that it might not work at all. I was literally shocked that it eliminated the spot ALL TOGETHER! The oil spot I was treated had multiple layers from leaky oil gaskets in my car that sat & layered on top.of old oil spots. I used it on several other spots & worked the same. The spot I used it on was about 3 x 3 & required the entire bottle. I used a broom to brush off the powder then hosed down the area. I would HIGHLY recommend wearing a dust mask / glasses when brooming off the dried powder. It is very fine dust-like when brooming & irritated my airway when I inhaled it. On a windy day, it will also carry the fine dust particles away so I'd close windows & keep away from kids & pets. Otherwise & if you protect yourself, I could not be more pleased with how well it removed the stain!

See pic, this was after three applications (about 2/3rds of the bottle used). I wish I had taken a before pic, my generator leaked and basically there was a big oil stain about 12 in across. Super dark. This stuff just kinda ate it up, dried, sweep into dust bin, apply again. Could not be easier.

To be fair, my application was pretty much a worst case scenario. The oil spots were more than a year old & they came from a diesel engine, so the oil had been very black with soot. This product may work better on fresh oil stains.I used it as directed. It gels up pretty quickly, so be prepared to move fast when you apply it & spread it well. I rubbed it in with a stiff brush. The following day, I removed it & found that it left a white powder behind, that made it look like the oil stain was less dark, but also made the surrounding cement look more white. After a few rain storms, the white powder was gone & the oil stains were very close to what they had been before. The surrounding cement was the same as it had been too. I had left a few oil spots untreated for comparison. There is a difference between the treated area and the untreated area, but it is not a big difference.

This stuff did not work any more effectively that I could tell than a simple degreaser. It does not cover a very big area of stain. It makes quite a big mess with all the white stuff it leaves behind. It seems like a gimmick rather than a valuable product. Cost per area is clearly higher than some degreaser I bought for $12 per gallon. I could cover fully 6-10 times more area with the gallon than with this stuff. The white stuff is still in my driveway despite 4-5 rinses with a pressure washer and hose.

Have used this numerous times for oil leaks on the concrete. Works best if the oil is cleaned first then applied. Takes several applications to really get most of the oil out. The sooner you work on it the better the results. Dries overnight. No smells. Overall an okay product for a frustrating situation.