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 grout cleaner is a beast. This is how I used. We just moved in and we were the 3rd owners. The kitchen was "clean" except for hidden areas like on top of the cabinets, where the cooktop met the countertop (seam), underneath the microwave, and of course the grout. We're talking caked in grease. It was bad. After cleaning all this up with degreaser and an aggressive brillo pad I looked around and the floor still looked bad. I need to fill in some cracks where the tile met the cabinets and so I looked at the grout. Seriously I thought the grout was a chocolate brown but no it was grease and dirt. I ordered this product and got to work. I sprayed it in 5x5 sections. I walked away for anywhere from 5 to 10 minutes then came back. I used the the supplied brush and scrubbed in straight lines. The nastiness that foamed up was incredible. I had a damp microfiber towel to wipe up the mess and an old bath towel (36" x 24") to wipe any excess left. This wasn't hard. You don't need expensive equipment. Spray it walk away, come back, scrub, wipe up, DONE. Your tile floors will look like new guaranteed.

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.

I sprayed on grout, left for 15 minutes. Used heavy duty utility brush with long handle. Cleaned well, grout looks much better. It was worth the money.

I think this works reasonably well, unfortunately, despite wearing gloves and having never had a reaction to any cleaning product before, I felt a rather immediate cramp in my stomach (likely from fumes and I had no contact with the product) I cleaned about ¼ of my tile and decided to stop. Today I used a very small amount (one spray) and immediately had the same stomach cramp and this time my lips became slightly swollen--again this was ONLY from fumes of one spray in a well-ventilated area. So I'll not be using it again. I've not had an issue with any other cleaning product in my life...and the smell was very light. I'd have thought it had a low VOC except for my reaction. I'll have to research how to dispose of the product safely.

Best grout cleaner I’ve ever used. Just moved into a new house. Well, new for me. The white grout in the bathroom was very dirty. Black in some places. I’d say this took off 90% on the first round. The wait time after applying is extremely short - a minute and a half. The brush that came with it is very effective.

I sprayed this in the grout lines in my shower and went in 30 mins later with a brush. I recommend this cleaner. Brightened the grout even though my grout wasn't bad to begin with. I can tell it will work just fine!

I've tried several types of grout cleaner, including homemade. This worked best! Some grout lines took two/treatments and you do need to scrub some, but it worked best so far!

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.