StoneTech Mold & Mildew Stain Remover for Natural Stone 24 Ounce Spray

This product is Amazing! Don’t hesitate to buy!! I used it on my Carrera marble shower and bathroom floor I have polished basketweave marble, which has lots of grout. It took away all mildew and grime. I left it on just a few minutes and used a small Nail brush scrub the grout. It came up like brand new. I have White grout. I have never found a product to use that was safe for my polished marble and the baking soda that was suggested to me just didn’t cut it. The smell is clean and no residue. I followed the directions which said rinse after scrubbing. This product makes me so happy to clean my shower ;) Thank you STONETECH !!! I’m going to try other products from them ❤️

So after remodeling my bathroom, I had come to regret putting in a natural stone floor in my shower. It is so hard to clean I have literally thrown my back out scrubbing the mildew from the grout and walls. I saw the DuPont mold and mildew stain remover while scrolling through Amazon. I have tried every natural product , home remedies you name it I have probably tried it. Can’t use commercial chemical based cleaners for fear it would ruin the stone. I figured this said it was formulated for the real stone why not try it after reading some great reviews. Let me tell you Wow.. this product is a game changer for me. Super easy to spray on.. I let it sit about 5-10 minutes scrubbed it with an electric scrubber.. hand scrubbed a few spots between the tiles. It came off super easy. It seems to be super gentle on my tile. The smell is a bit strong be careful if you’re sensitive. I can’t believe the difference super happy with this product. Before and after is incredible.

I do house cleaning for a living. I've tried everything from chlorine bleach to peroxide etc. to eliminate mildew and pink slime. Nothing works. But this product has been a huge game changer! I'm amazed how the black mildew just disappears with minimal scrubbing! I'm using it on multiple jobs now and highly recommend this cleaner!

This was great for mildew on my marble tiles. Mold not so much. But to be honest, the mold is growing behind the silicone caulk. So it probably just isn't making contact with it. Some day, I'll rip out the caulk and try treating the mold. Stay tuned....

We had just remodeled our bathroom and I use the shaved pebble for the flooring in the shower so I was thrilled to see there was a product that wouldn't destroy this natural stone but would do the job of keeping control over mold and mildew. So far it's doing a great job and I presume that will continue to do so. Pleased.

At first this product seem to be exactly what I was looking for. I could see that it was removing the mold and mildew from my shower floor which is marble tile. I was using it mostly along the perimeter grout lines but then I sprayed it more directly on the marble tile. After a few uses the orange spots increased and also notice that it made an imprint/discoloration on some of the tiles. I also noticed that the cloth I was using to clean with started to look like I dumped a cup of bleach on it. Needless to say I won’t be using this on my marble floors and I should have known better because it had a bleach smell to it.

We live in Southwest Florida where the combination of high heat and humidity makes it ideal for growing mold and mildew. Getting it off natural (unsealed) stone is not as easy as you might think. Most of the products I researched will damage natural stone because of the Ph. People tend to forget that natural stone is porous and will absorb liquids -- and therefore show stains. Trying to use regular grout cleaner on marble will result in the marble edges touching the grout looking like someone buffed the sheen off it. Not good! After looking, researching, and trying several grout cleaning products, I finally found this DuPont Stonetech Mold & Mildew Stain Remover. It is a bit pricey but after several failures I was willing to pay a little more to effectively solve my problem. Our shower stall is composed of travertine walls and floors. Since it is in the corner of our master bath and has almost a floor-to-ceiling glass door, there isn't enough air circulation in it to prevent the formation of mold and mildew. Mold and mildew removal is pretty easy. Simply spray the mixture on your grout lines, wait a few minutes, and then scrub with a non-abrasive sponge or an old toothbrush. It doesn't take a lot of effort although stubborn stains will require a second treatment. The other tool that I've found to be indispensable in cleaning the shower is to use a clothes steamer. Anything that resists two treatments with the DuPont Stonetech product will easily be eliminated by using your clothes steamer. Just hold the steam head very close to the grout and the mold/mildew will disappear. And if there is still evidence of mold/mildew, try using a fine tipped scratch pen/sanding pen. Amazon sells the KTI-70550 for about $7.00. This essentially allows you to sand the offending mold/mildew off the grout while staying on the grout line and avoiding the marble edges. While using this cleaner, make sure that you have proper ventilation and use a mask to avoid breathing in the fumes. That strong smell that reminds you of bleach is sodium hypochlorite -- which is actually BLEACH. So take care to protect yourself and not damage your lungs. After using your clothes steamer for awhile you may decide that you get acceptable results (depending on how bad the mold/mildew is) just by using the steamer and avoiding the fumes.

The product works well but the packaging for shipping is terrible. Do not have this delivered with other items. It leaked all over the other items I purchased (one being a cell phone charger!) and destroyed the packaging on my other items too. Not to mention that half the bottle is now empty, which is extra frustrating since the cost of the product is pricy.

This product works! For years I have been scrubbing my grout and tile trying to get the orange color out of my grout. I have tried so many different products and nothing has worked. I finally came across this one and thought I would try. Look at the left half of the photo. That was after 10 minutes and a rinse. No scrubbing! This is the first time that my tiles have looked clean!

Read all information carefully and then apply. The smell is very powerful is the only drawback. Having said that make sure to turn on any fans that you have in the area. This is the best product that I have found for its purpose. I left it on overnight and all stains and mold were gone. I highly recommend the product. Shop arround because price differs greatly between sellers. This a market place product and there are no returns.

I've tried everything from all the big brands. If it had the word Mold or Mildew on the label, I have bought it and tossed it. But this actually took the gross away from the grout in my shower stall. Not 100% but still visibly cleaner. And no harsh smell - just vaguely bleach-y.

the stain in my counter didn’t come out.

After having mould issues for a few years, Stone Tech Mould removal resolved the problem. We periodically reapply to ensure the mould doesn’t return.