Black Diamond Ultimate Grout Cleaner: Best Cleaner for Tile,Ceramic,Porcelain, Marble Acid-Free Safe Deep Cleaner & Stain Remover for Even The Dirtiest Grout. (1-Quart/1-Brush)

This stuff works and is easy. Top half is after, bottom is before. It removed a ton of dirt from the grout in my work's restrooms. I didn't know the grout was white before. Using a hand held scrub brush, 1 pass most was up. Did 2 passes and scrubs just to make sure everything was clean. Didn't really need the 2nd pass. Didn't damage the tile.Highly recommend a fan while using and working in small sections. The smell isn't terrible but it does build up. Some towels you dont care about helps the process. Wiping up what was scrubbed helped a lot for clean up before mopping.The bottle arrived sealed and wrapped so it didn't leak in transit.

Tried the Zep cleaner first - two applications and it didn’t touch most of the stains in my floor tile grout. This product went in to work immediately and removed ALL stains in my light gray grout which I suspect the contractor failed to seal properly. I did a second application just to get the grout extra clean before I seal it myself. Great product - highly recommend.

Works great in the grout and no harsh smells but you still have to scrub to get the dirt up

Didn't work on a back splash

The cleaner worked great! It’s been two years since cleaning the grout, so it was dirty in a lot of places. I sprayed on the cleaner, waited the recommended three minutes, used an electric brush to clean the grout, and then wiped it down with clean water. After it dried, the grout was back to its original color.A few warnings. This stuff has a powerful odor. You will want to ventilate properly. And wear rubber gloves when doing the cleaning.Secondly, biscuit color grout looks dark when it is wet with the cleaner. I applied the cleaner several times because the grout was still dark after applying the cleaner the first time. It wasn’t until everything was dry that I realized the cleaner worked the first time. Don’t do extra work needlessly.

The before & after photos speak for themselves with how well this stuff works!! I’m thoroughly impressed. I tried just about every cleaning supply other than anything containing bleach (because I’m very sensitive to it) on shower and nothing took the stains out. I do a lot of spray tans year round to avoid sun damage, so naturally, it tends to stain the grout over time. This took MINIMAL effort with the scrub brush and it looked brand new again! I will warn you that if you have any grout that is painted, DO NOT USE! I made this mistake and it started smearing the paint on to my white tile. Thankfully, it came out, but I’m only going to be using on my white grout going forward. Other than that, I highly recommend for tough stains.

This grout cleaner did the job! The grout was a light brown and now it is back to the original light tan. The tiles look like they did when the house was first purchased.

I live on rain water so it is not the clearest of waters. Needed a grout cleaner that really works since it was awfully stained. I'm so glad I tried this cleaner because it worked, not a waste of $20ish! The only parts that didn't get completely clean were at the edge of the shower pan because I didn't want to scrub hard since the grout is breaking off. In conclusion, don't let the price scared you off fearing it may not work because it definitely works...the only thing that has worked for me!