DRYLOK 01908 Masonry Etch, 12-Ounce

It cleared the calcium on my foundation wall so I could prep to paint it. It also cleaned the concrete really well. I recommend it if you’re looking for a very thorough clean and to eliminate mineral buildup. Rinse thoroughly before I thought it was ineffective until I realized I was seeing leftover product on the walls and not minerals coming back. Also make sure you purchase a good scrub brush, gloves, safety goggles, and a shower cap. This stuff is pretty strong and can splash as you scrub. After using the product I followed up with drylock sealer. I recommend the entire product line for improving old concrete.

Very old product, the inner lid was no longer attached. The powder inside could be anything since after carefully following instructions it didn't work, the masonry looks exactly the same if not worse. Do not recommend the product.

This product works as described. Smells really bad, but does the job cleaning concrete basement blocks. Would recommend that you prepare a large area before mixing. It goes a long way, but if you don't plan on using it for a large area, then you are wasting most of it. Be sure to wear rubber gloves when applying and be sure to allow the area adequate time to fully dry before applying any paint or dry lok.

Works ok .not as good as i got in a floor refinishing kit.

This did wonders on removing the white efflorescence on ceramic tiles on my outdoor patio.As soon as I applied the mixture you could see it bubbling and dissolving away the efflorescence. Where the white stuff had really built up, I used a razor scrapper to loosen it up. I did have to do 2 or 3 applications to get it all out, but each time the amount of white had been reduced significantly. I have no idea what the negative reviewers say about it smelling awful - mine had very little smell. Note - I am not using this on porous material like brick.