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128 oz. Duo Blast Mold and Mildew Deep Stain Remover

$18.46
  • Eliminates stains and prevents mold and mildew indoors or out
  • Great for mold clean-up, eliminates the need to scrub and rinse
  • Ideal for wood, concrete, drywall, stone, laminate and vinyl
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Product Details

Concrobium Duo Blast is a ready-to-use solution that is composed of 2-liquids that, when combined, create a powerful formula that targets and removes tough embedded mold and mildew stains with no scrubbing. Apply and leave on moldy surfaces to eliminate stains and restore surfaces. Great for indoor and outdoor surfaces such as wood, composite wood, concrete, masonry, drywall, stone, grout, fiberglass, plastic, laminate, vinyl, canvas and fabric. Works on both painted and unpainted surfaces.
  • Targets and removes tough embedded mold and mildew stains
  • No scrubbing or rinsing required
  • Safe on fabrics
  • Contains no bleach and wont discolor surfaces
  • For indoor and outdoor use
  • Cleans 250 sq. ft. to 300 sq. ft.
  • Return Policy
  • California residents

Additional Resources

From the Manufacturer

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Specifications

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Questions & Answers

22Questions
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Q:Can this product work safely on exterior mahogany wood doors to remove black mold and kill spores?
by|Dec 6, 2020
2 Answers
Answer This Question

A:  Ed, this product should work for you, but may take several applications. If your mahogany is sealed with stain then you can probably remove the mold with a mild cleanser and a scotchbrite pad. If the wood is not sealed then the mold has likely seeped into the wood and will require multiple applications. Concrobium works best when it is allowed to dry completely, so let it dry before evaluating if it is working.

by|Dec 7, 2020

A:  Happy to help Ed. Rust-Oleum Concrobium Duo Blast Mold & Mildew Deep Stain Remover can be used on a variety of surfaces, including wood. As with any cleaner, we recommend testing on an inconspicuous area first to ensure favorable results. Apply Duo Blast to the affected area as directed on the bottle, allow the solution to remain on the surface for a minimum of 2 hours, it may take up to 24 hours to see the full results. Duo Blast eliminates tough stains, it is not a mold eliminator. To eliminate mold use Concrobium Mold Control. Apply Mold Control over the affected surface in a thin even layer and allow to air dry completely. Mold Control works as it dries with no bleach, ammonia of VOC's, crushing mold spores at their roots. https://www.homedepot.com/p/Concrobium-32-oz-Mold-Control-025326/100654126? - Rust-Oleum Product Support 6

by|Dec 9, 2020
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    Q:Can this be poured into a regular spray bottle and used? Will it mix and have the same effect as ...
    by|Nov 12, 2020
    2 Answers
    Answer This Question

    A:  I used a regular spray bottle and it worked well. The solution will bubble and expand when you mix the two ingredients. I allowed for this by filling the spray bottle 3/4 full and pressing it slightly before screwing the cap back on. As the solution expanded the bottle filled out but all worked well.

    by|Dec 2, 2020

      A:  Great question! Our Rust-Oleum Concrobium Duo Blast jug should be used in a vented pump sprayer or bucket to prevent a vapor pressure from building. If a trigger spray is desired we recommend purchasing the product in spray bottle form: https://www.homedepot.com/p/Concrobium-33-8-oz-Duo-Blast-Mold-and-Mildew-Deep-Stain-Remover-029-6670/305195647 - Rust-Oleum Product Support 8

      by|Nov 12, 2020
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        Q:Is Duo Blast effective again mold if it is used through a fogging machine? ULV fogger
        by|Nov 11, 2020
        2 Answers
        Answer This Question

        A:  Happy to help Joe! Rust-Oleum Concrobium Duo Blast Mold & Mildew Deep Stain Remover cannot be applied using a ULV fogger. Duo Blast can be applied using a pump sprayer or bucket, pour the entire contents in of the bottle into the sprayer tank or bucket. Spray or mop on the surface withing 2 hours of combining the solutions. - Rust-Oleum Product Support 6

        by|Nov 12, 2020

          A:  Duo blast should be effective in a fogger, just realize that there will be extra pressure in the fogger's reservoir. The two ingredients of Duo Blast expand when mixed together; exactly like mixing vinegar and baking soda.

          by|Jul 8, 2022
          1 found this answer helpful
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          Q:What is the difference between the Duo Blast and the Mold Stain Easer? Will one remove stains bet...
          by|Aug 28, 2020
          2 Answers
          Answer This Question

          A:  We used the DUO BLAST on our cement floor and wooden doors mold stains in our basement storage area. it did a very good job in removing the stains. Follow the directions.

          by|Oct 7, 2020

            A:  Thank you for reaching out! Our Concrobium Duo Blast Mold & Mildew Deep Stain Remover is a 2-part cleaner that create a powerful solution which targets and removes the toughest embedded mold and mildew stains with no scrubbing. Our Mold Stain Eraser is a 1-part cleaner, which is dissolved in water prior to applying to surfaces. The Duo Blast is more effective for removing especially difficult and deep-rooted mold and mildew from porous surfaces. - Rust-Oleum Product Support 2

            by|Sep 5, 2020
              2 found this answer helpful
              Showing 1-4 of 22
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              Customer Reviews

              2.7 out of 5
              (103)
              • 2.7
                out of 103 reviews
              • 44%recommend this product
              Filter by:
              Showing 1-10 of 103 reviews
              We had the worst black stains on the wood floor...
              We had the worst black stains on the wood floor from years of wall to wall carpet and its underlayment being walked on, and who knows what spilled on it. We rented a belt sander from the depot, used it as per directions and applied this stuff specifically to the stains, not expecting much. Holy cow, it worked beautifully. Highly recomened would give 10 stars if I could.
              by
              • Verified Purchase
              I have mold spots in the vinyl weather stripping on my Marvin patio door. 5 applications--each a ...
              I have mold spots in the vinyl weather stripping on my Marvin patio door. 5 applications--each a day apart--made almost no difference. I would not buy the product again.
              by
              Response from Rust-OleumSupportJun 23, 2020
              Something is amiss here. Keep in mind that the Rust-Oleum Concrobium Duo Blast is designed to remove the stains left behind by mold. To kill the mold, you'll need to use Rust-Oleum Concrobium Mold Control.

              https://www.homedepot.com/p/Concrobium-32-oz-Mold-Control-025326/100654126 - Rust-Oleum Product Support 5 Rustoleum
              • Verified Purchase
              Worth it
              The bottle is designed terribly. Took me 1/2 an hour to get the spray to work properly. I had to open it and re-insert the tubes so many times. But the product is amazing. I had dark black mold. It’s gone. I’m amazed.
              by
                • Recommended
                Works fine, does the job...
                Works fine, does the job
                by
                • Verified Purchase
                Spray a 50-50 solution.
                Product works on black mold & if you can get product to spray equally. Because of the latter, can only give average review. Used this to remove black mold trim in a cellar. Took days and repetitive treatments but worked.
                by
                Response from Rust-OleumSupportApr 7, 2021
                We appreciate your feedback! Ensuring Rust-Oleum Concrobium Duo Blast Mold and Mildew Deep Stain Remover is mixed equally is key in ensuring the best results. For the best results, we recommend first treating the surface with Rust-Oleum Concrobium Mold Control and then using the Duo Blast to remove staining from the mold. The Mold Control can then be used on the surface again to help prevent future mold.
                https://www.homedepot.com/p/Concrobium-32-oz-Mold-Control-025326/100654126
                - Rust-Oleum Product Support 3 Rustoleum
                  • Recommended
                  Amazing, easy to use and very very effective and safe....
                  Amazing, easy to use and very very effective and safe.
                  by
                  • Verified Purchase
                  1 found this review helpful
                  I can only give 3 stars, the product worked pretty...
                  I can only give 3 stars, the product worked pretty well, but the dual pump/nozzle device was a disaster. It didn’t spray properly as one solution is more viscous than the other and it failed to spray, let alone spray evenly...had to mix the two in a different spray bottle, which worked a little better, however you can only mix a small amount at a time, as the product once mixed will foam up!
                  by
                  Response from Rust-OleumSupportMar 19, 2021
                  Thank you for the feedback about the Rust-Oleum Concrobium DuoBlast. We'll be sure to forward this along to the right team! - Rust-Oleum Product Support 5 Rustoleum
                  • Verified Purchase
                  It works and no strong odor
                  I moved into an apartment and there was a nasty build up of red mold on the hinges of the bathroom door. I called Concrobium customer service and they suggested to use Mold Control first to kill the mold, and then to use this product; the Mold Stain Remover. The staining was very bad, and I did 3 applications to totally remove the staining. Overall I’m pleased with Concrobium products. It’s worth adding that there’s no noticeable odor. Also, note that the product doesn’t come with a sprayer. The jug has 2 sides with two different solutions that need to be combined just before application. For spraying you need a vented spray bottle that Home Depot sells for a few dollars. Also, for dealing with any mold situation protect yourself with a mask, gloves, and goggles. Mold causes significant health issues.
                  by
                    • Recommended
                    No sprayer included!!!!
                    I had to return this item because it didn’t include a sprayer! I originally had a smaller bottle that came with the sprayer. This was not available at Home Depot.
                    by
                    Response from Rust-OleumSupportJan 4, 2021
                    Thank you for reaching out! The Rust-Oleum Concrobium Duo Blast Mold and Mildew Deep Stain Remover in the gallon bottle is intended to be poured into a bucket and applied manually.
                    - Rust-Oleum Product Support 3 Rustoleum
                      Didn't work at all!
                      I don't get it, all these great reviews. I bought 2 gallons and applied it with a sprayer, a few places foamed a bit, but three days later and no difference. Dry pavers, no rain and NO difference. May as well have just sprayer the pavers with water.
                      by
                      Response from Rust-OleumSupportDec 23, 2020
                      Hi Kathy, our Concrobium Duo Blast is designed to work over time to remove mold and mildews stains from the surface. Typically, results are clearly evident after 24 hours, so it is odd to hear that no difference was seen after 3 days. The surface may be extremely porous, and a second application may be necessary to completely saturate the area. Please give us a call at 800-466-7126, we want to try to make things right! - Rust-Oleum Product Support 2 Rustoleum
                        Showing 1-10 of 103 reviews

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                        Where to UseBathroom,Floors,Furniture,Kitchen,Laundry,Metal Surfaces,Outdoor,Plastic Surfaces,SpecialtyOutdoorFloors,Furniture,Hard Non-Porous Surfaces,Metal Surfaces,Outdoor,Plastic SurfacesBathroom,Kitchen,Outdoor
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