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)

I watched one of the review videos on this product and was impressed by how it cleaned the shower grout. I was still skeptical, but ordered it anyway. When it arrived, I immediately use it on the grout on my bathroom floor where I have marble tile. This product did say it was safe for marble. I used it along with the brush that was included. It didn’t take a lot of scrubbing to have the grout immediately look cleaner. This is definitely a good product! I have since used it in my shower, which is also marble tile stone. It took away the rust stains, just as easily as it did the grime stains on the bathroom floor. It’s nice to find a product that actually works and is not all hype!

I saw this advertised and decided to check it out. Just spray, let sit a few minutes and scrub with the brush. It works in seconds. Its so easy to use. Just spray on the grout, wait a couple minutes and scrub. Years of stain came off. It has a pleasant smell. The mist spray makes it go where you want it. I no longer dread cleaning the grout.

This grout cleaner is genuinely effective — it lifted years of dirt and grime that other cleaners barely touched! The quality of the cleaner itself is impressive, and the included brush makes it easier to get into tight grout lines. It’s definitely a powerful cleaner that delivers results without damaging tile. That said, the bottle design could be better. Mine had a bit of leakage during shipping, and the solution is slightly sticky when it dries if not fully wiped up. The smell is noticeable but not overwhelming — more “cleaning chemical” than fresh scent. The bottle and spray nozzle feel durable, though, and it should last a while. Overall, a great product for deep cleaning grout — just be mindful of the slight mess factor!

This works so good! Made my grout bright white and before it was a dull brown color! I used a tall grout brush which I bought separately and it made it a breeze to clean the grout!

Worked great! Didn't damage my marble. Worked as well as peroxide and baking soda with less scrubbing.

All I can say is this product works! I started in our bathroom that has white tiles that are small. My husband said wow I can see the difference right away. I used a different long brush that I use when cleaning however; this is an amazing product. I can’t wait to see the rest of my home shine!

I did not find success with this stain removal. Looked good for a day or two and then look exactly the same prior to trying cleaner. Would not recommend.

I had high hopes for Blue Diamond Grout Cleaner, mainly because it doesn’t have the overpowering smell that most grout cleaners do—that’s definitely a plus. Unfortunately, it didn’t perform the way I expected. I applied a generous amount to my ceramic tile and let it sit much longer than recommended (2–3 hours instead of a few minutes), and even repeated the process. Despite a lot of scrubbing, I only saw a very slight improvement. I even tried adding Dawn dish detergent to boost the cleaning power, which helped a little more, but still not enough to make a real difference. Overall, it performs about the same as many other products that claim to be “the best.” I wasn’t impressed. Put It to the Test (Even With Steam)—Still Falls Short

Buenísimo para limpiar las juntas de los azulejos o pisos de cerámica Me parece caro pero es muy bueno

No funcionó en mi cocina, Apliqué, deje actuar por 5min y utilice el cepillo Cepille bastante tiempo y solo cambio muy muy poco. No lo recomiendo por el precio puedes encontrar algo mucho más barato que limpie mejor

I have tried a lot of grout cleaners. Truthfully this is the most effective one I have found. You won't be disappointed. Albeit you are still on your hands and knees with a scrubbing brush, but you can actually see the dirt start to bubble up. You will need to wipe down each area where you apply the cleaner, but I would suggest that if you have a floor steamer, use this rather than just washing the floor with your usual cleaner.

It is so easy to use. You spray it on and 2 to 5 minutes later, scrub it with scrub brush, then rinse it. Good as new.

It's expensive and doesn't work as expected.