Tenon Concrete & Masonry Dissolver - Remove Concrete, Cement, Mortar, Grout, Stucco, and Masonry From Tools, Mixers, Wood, Plastic, and Aluminum, Ready-to-Use (5 Gallon, 1)

Very effective and removed mortar and grout from tile that had been left for 4 year. It was easy to use, just follow directions. Residue after dried removes with vinegar and water. I thought we would never get the floor clean and then we found this product. Great value

It works miraculously great product

When my new porch was poured, residue got on the house siding. This product removed it without damaging the siding. I will need to retouch the paint but it looks better.

After 8 years of renters it's time to replace the ceramic tile, that's beginning to resemble mosaic. I'm lucky that the sub-floor in this house is quality, solid plywood. I want to remove all the mortar & I was looking at 3 days of knee torture. This stuff popped up while I was looking for an air-scraper. I poured some of this liquid in a smaller container, the brushed it right on top or the mortar. I brushed this stuff on about a square foot of mortar, which soaked it up quickly. I was hoping it would soak through to the mortar in contact with the floor, so I put up some strong resistance to follow the man-code of not waiting, and just start wailing on the grout with my framing hammer (á la the opening scene of "2001 A Space Odyssey"). After a while the mortar was a kind of chalky-white, and when I hit my 1½" chisel, the mortar started coming off in pieces up to palm-sized. This stuff isn't exactly cheap, but it's a heck of a lot cheaper than two new knees.

Bought this product because it was recommended to have a product on hand after pouring concrete. Used product just as label said. Used nearly entire bottle, and only result I got was it dulled the paint finish. Didn’t even work on glass.

This is not a spray and wipe. I used a wire brush and a bit of concrete came off. Not enough for the efforts that I put in it. I ended up buying muratic acid, it worked a lot better.

I get the impression that people think you can make a product that will just eat through any cementatious product of any thickness or hardness. This isn't possible even with the strongest acids. But this stuff does disolve thinset. I'm totally impressed. It's non-toxic, non-corrosive, and yes you may need a couple of bottles depending on how much you need to dissolve, but this works better than a wire-brush or razor or all sorts of other options. So know what you're getting here: if you left mortar all over a bunch of flagstone, no this wont help that much. If you have thinset on tile or stacked stone because you're not a great mason, this works impressively well. But you might need a couple of bottles.

Amazing stuff! Just don't spill it on a concrete surface that you want to keep. The liquid seems to dissolve the magnesium crystals in concrete. It doesn't happen quickly but eventually the concrete will begin to crumble and then you can remove the offending cement/concrete with a hammer.