Akona Concrete & Masonry Dissolver (28 oz, 1)

Had to remove 2 year old concrete from iron railing and this worked like a charm. This was not a few simple streaks, these were dried on drips over a foot long and in some spots 1/4” thick. I wrapped paper towels around the uprights and soaked them with the solution, let them sit for about 30 minutes, and went to town on them. Because I had to paint the rails anyway I took the them with a scraper, in some spots in just wiped off, in others I had to go at it with the tool, it honestly worked great! Be warned do not wet the concrete first, be prepared to put some work into thicker spots, and put drops clothes down because it will start to eat the existing concrete. This solution definitely weakens the thicker spots where just a few taps with the scraper got the big chunks off. I will be buying this again 100%.

Read the other reviews, don't know why it did not work for others but worked well for me after driving through some wet concrete and not getting round to dealing with it for about a year!! Need to give it enough time to penetrate to concrete and took 4-5 applications to work through the layers as the dried concrete was pretty thick in places. Also used a cheap plastic scraper to get the stubborn spots off. Don't expect to spray it on and wash it off and be done - be patient, let the chemicals do their work, expect it to take multiple applications to get everything off, and put in some elbow grease / effort, and it does deliver results.

Loved this product. It worked quickly but did not damage my auto finish. I used a plastic scraper to get the concrete off. It was finished in about ten minutes. Took longer to set up the task. Very happy to have found this product.

Only removed a few concrete spots. Unfortunately, most spots remained.

I used this to get concrete off copper pipe. It somewhat worked a little bit along with some elbow grease and persistent scrubbing, it helped remove some concrete but I wouldn’t say it did an excellent job. The smell isn’t horrible. Easy to use and the bottle did not leak.