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Model #029-4674

Store SKU #1003330534

128 oz. Duo Blast Mold and Mildew Deep Stain Remover

  • 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 Overview

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.
  • California residents

Info & Guides

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Container Size
1 Gallon
Product Size
128 OZ-Ounce


Concentrated or Ready to Use
Ready to use
Regular Strength
Pack Size
Paint Prep & Cleanup Product Type
Mold & Mildew Product
Product Dispenser Type
Trigger Sprayer
Product Form
Recommended Surfaces
Carpet,Concrete,Dashboard,Fabric,Fiberglass,Glass,Granite,Laminate,Limestone,Marble,Metal,Painted Surfaces,Plastic,Porcelain,Quartz,Rubber
Types of Surfaces Cleaned
Where to Use
Bathroom,Floors,Furniture,Kitchen,Laundry,Metal Surfaces,Outdoor,Plastic Surfaces,Specialty

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
Satisfaction guaranteed for full refund of purchase price

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 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.
  • 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.
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.
    • Recommended
    Works fine, does the job...
    Works fine, does the job
    • 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.
    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.
    - 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.
      • Verified Purchase
      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!
      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.
        • 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.
        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.
          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