Ultimate Grout Cleaner for Tile Floors — Acid-Free Deep Cleaner Removes Grease, Dirt & Soap Scum Without Damaging Grout — Safe for Marble and All Natural Stone (1-Qt/1-G/ W/brush)

This formula is just fantastic! I’ve tried ANOTHER product not as effective which I had to return for its strong chemical smell. I have asthma and could not tolerate the smell even with a mask. Black Diamond has a pleasant non-toxic clean smell. I was indeed impressed with its effectiveness and how easy it was to clean 13 years of dirt on my floor tile grout. I used a plastic squeeze bottle to apply the cleaner, waited 5-10 minutes, scrubbed the grout with a long handle brush I found in Amazon (to avoid bending or kneeling over) and saw the magic happen before my eyes. Amazing results! I’m extremely satisfied with this product. I did finish cleaning the grout with my steamer, but just as an additional step to disinfect the floors. I’ll buy this product again.

I was skeptical but this stuff really works. Use as directed and it cleans my grout that has been left for over 5 years without more than plain mopping. Highly recommend. I have travertine, tumbled marble and porcelain tile. Cleans them all.

Works great on soap scum but not so good on grout.

Did an ok job, but not as well as some others said they experienced, even though I tried multiple times and let it set for a period of time.

I always read the reviews but try to take them with a grain of salt: is it really that amazing. This one is. I used it first on a small bathroom floor with white grout-or what used to be white grout. First I noticed that it didn't stink. I am super sensitive to smells and this did not have a smell, not even a perfumy one. Other than the spots where the grout had broken up and patches are needed, it did great. Perfect-probably not but that grout is at least 10 years old. It gets washed and I have tried some other products with no difference. This made a RADICAL difference! So I kept going to the kitchen with dark grey grout. What i liked out there was it cleaned the tile in the tight spots near doors and the stove that get grimy but a swiffer just doesn't do enough for. The grout looked better too. My one complaint is the product seems to leave a soapy residue. I don't own a sponge mop so trying to clean that up was difficult. I would suggest making sure you have a traditional mop of some kind to wash the floor with after. Swiffer won't work.

I've got a tile floor with tiny little half inch by 2 inch marble tiles and more bright white grout than any sane person would ever willingly put into their own home, so naturally I've tried just about every solution for cleaning as it's a never ending battle against grime and discoloration. Enter Black Diamond - at the time I believe it had 4.5 stars and was specifically advertised for grout with natural stone tile, so I gave it a shot. It is not a good product. The instructions on the bottle say spray, leave 1 to 3 minutes, agitate and wipe clean. This produces no change in the grout color whatsoever. In the reviews, others mention letting it sit for up to 15 minutes and then scrubbing heavily with a bristle brush to see better results, which does indeed work... but not because of anything in the black diamond product, it's just because you get anything wet for 15 mins and scrub with a bristle brush and it will remove some grime. Water accomplishes the same job for free and requires exactly as much elbow grease. A cleaning spray with bleach is infinitely more effective at restoring color and many multiples cheaper, but will pit the grout over time. Pink stuff mild abrasive scrub will also do a much better job. I can't see any reason why anyone would be paying more than $20 for a bottle of whatever the hell this is - it's acid and bleach free, which basically means ineffective when you're talking about the kind of grime that accumulates on floor tiles!

I used this with a spin scrubber on very stained grout, and it did a great job. The grout looks new again.

Wow, I'm impressed. I can't believe how easy and fast this was. I did my whole house in a couple hours. I sprayed it on, let it sit a few minutes and then used a stiff brush to remove the dirt. I got one that you don't have to bend down to use. Perfect. I then rinsed the floor and enjoyed the nice clean grout! There is no smell and only a small amount of residue that I'm sure will come off with the next full floor wash I do. I'm thrilled!

Excellent, you have to work with it, that is use an old tooth brush to work out the dirt cos it not magic, you wont be dissatisfied if you do your part.

I bought my house and the floors looked like they hadn't been cleaned since they were originally installed. The before and after are mind blowing!! I didn't mind the smell of the cleaner. It made it smell.. clean. 5 star review Highly recommend this product.

Good product, quick delivery, would recommend

Used on grey grout it does work but took a few applications I found it easier to brush on lightly as solution strong and can damage other surfaces

ordinary bleach left on for a while did a better job in my kitchen! 99p instead....