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)

This removed a lot of dirt from the grout. It definatly improved the appreance from black to what it is now. It did not however remove 100% of the dirt or make it look brand new, at least for me. It could be due to the age or how long it had been covered in dirt to begin with. There are products that can "paint" the grout a new color, you will have to remove the dirt before you can use those products. This worked alot better than just tile soap with mop and bucket. I May need to try another product in combination to get it cleaner. I will try that before I consider the "painting" option.

I'm not sure the grout in our bathroom has been cleaned since the floor was installed 20 years ago. Sure, the floor has been mopped often, but nothing for the grout in particular. So I really didn't expect to get the grout looking new, I was just hoping for better.The grout now looks pretty much new.After a bit of trial-and-error, here's the process I used.1) Buy a battery powered scrub brush. These look like an electric toothbrush on steroids. I bought one by Rubbermaid, but there are others that are probably equally good. I can't imagine using this with a hand scrub brush.2) Spray this on the grout, let sit for 5-10 minutes. Not any longer, or it will dry too much.3) Go over the grout with your battery-powered scrub brush. Multiple times. Over a 2-3 minute period. This part is critical, the first cleaning got a lot of dirt up, but with repeated brushing it got *really* clean.4) Rinse a couple times.5) Wait a couple hours for the grout to fully dry, and admire your handiwork!For me, a couple spots needed a second application, but the floor looks so much better now. Highly recommended.

My rented house kitchen tile grout was filthy and probably never cleaned. I started by trying all the at home methods I came across online that promised to work, but of course didn’t. This stuff though, I was surprised to find really did the job and turned my almost black grout in spots back to beige. Did it require scrubbing? Yes. Did it take more than once? Yes, for the worst spots. Did it make my kitchen floor look cleaned? Absolutely! Another positive is that it has a relatively pleasant smell and the brush is good and held up for hours of cleaning. The only downside is that it’s on the pricey side for some floor cleaner and I used quite a bit through my whole kitchen and dining room.

Didn't work on a back splash

Very good. We bought a house that’s over 30 years old, and we got this to clean the grimy grout that was hard to even look at — and it works.Use the included brush first, then go over it with a softer brush for better results.Make sure to wipe off the grime with a clean towel. You’ll notice it’s even brighter the next day.

Used this on my marble shower grout lines and it cleaned them easily. I sprayed it on the entire surface of the shower, let it sit for a few minutes then scrubbed the grout clean without issue. This is a great product to use regularly. My grout was never extremely dirty so I can’t speak on its effectivess on neglected surfaces.

Wow! I have been cleaning my tile and grout for 6 months in a house we bought. I’ve tried special mopping solution. I got a tile scrubber and used the baking soda hydrogen peroxide hack among others to no avail. I sprayed this diamond grout cleaner along the grout and in 3 minutes scrubbed it with the included brush, wiped it up with a wet paper towel and it was like new!!!!!! Finally a product that did what it said! My grout lines were pale grey but almost black along the well walked areas. I assumed it was oil from peoples bare feet mostly making them so ugly. Yay! Clean as a whistle now! I had to be wary of harsh products because my tiles are marble.

Works but does require a little work with the brush