DuPont Mold & Mildew Stain Remover for Natural Stone

This stuff worked so well I actually wanted to cry. We have a full marble shower and it stays warm and wet in there constantly because it’s used a lot and the door can’t be held open. It was impossible to remove the black in the shelves and corners and grout and some of the scrub stuff can damage the stone.I sprayed this and let it sit and everything washes away. It’s amazing. I wish I had a before picture but I didn’t take one because I didn’t actually expect it to work as well as it did.As for the smell it’s kind like a chlorine. I opened the bathroom window and ran the fan for the day and made sure to rinse everything well. I’m ready to buy another bottle and am so happy I found this. It also removed some stubborn stains on the glass door.

Excellent product. Did its job . Had mildew and mold on the base of my shower floor and side . Works quite well on travertine. I recommend this product. Before and after photos submitted.

This stuff is amazing!I moved into a new home where the entire shower is marble- both walls and floor. The house had been empty awhile and so mold and mildew was creeping in, especially the orange type in all the grout on the floor.I could not use any of my normal cleaners on the marble and the 1 marble cleaner I had did nothing for the mildew.But this stuff worked wonders. It helped a but just by spraying it on, adding a good scrub and it was nothing short of amazing. The grout is clean is light gray again and all the marble is shining.

I used this to clean my natural stone shower which had black mold stains, growing black mold and lots of reddish mildew. It worked great on the mildew: just spray and a quick brush with a nylon brush. It also worked well on the growing mold on tile and grout. A bit more scrubbing than the mildew but less than other products I’ve used. It did nothing on the stains though. The fumes were strong but no worse than other mold and mildew cleaners with bleach. Overall this cleaner required less scrubbing than other cleaners, but I’m not sure it was enough better to validate the price.

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.

beware when you purchase this product. This leaked so bad that ups had to put it in a huge Garbage bag and a separate box

Our shower frequently gets ugly, pink residue in the corners. Since the shower floor is made from natural stone, I wanted to use a cleaning product that was safe and effective on both stone and tile. This spray works wonderfully on our shower. I spray it on the problem areas, leave it for 20-30 minutes, then when I return the spots have largely dissolved. After a quick scrub and rinse, I'm done. I've not had near as much success with other products and certainly none as easy to use as this. Highly recommend.