Ask Dave: More ways to kill mold in RV

Dear Dave, 
I don’t think your answer about how to kill mold with bleach was sufficient. See this article  [from bobvila.com]. —Amos, 2011 Jay Feather Select X23B

Dear Amos,
I received a few comments on the previous article you are referring to, which readers can find here.

This comment from Dale discusses the product Concrobium, that we have featured before.

I’m not an expert by any means, but I’ve read that there are several types of mold. Some types of mold are not completely killed with bleach, and it can actually make them resistant to bleach. I’ve read that using the product Concrobium is the most effective product for killing almost all types of mold. It’s available in many stores.

This is what the Concrobium website states.

Concrobium Mold Control is a unique formula that eliminates mold below the surface leaving an invisible antimicrobial shield to prevent mold from returning, all without the use of harmful chemicals. The EPA registered formula is the solution of choice for both professionals and DIYers.

Since 2003, Concrobium has created a comprehensive line of products including DuoBlast, a powerful and unique dual chamber cleaning solution that targets tough and embedded stains from mold and mildew on outdoor and indoor surfaces. Also in the line is Moisture Grabbers. The unique water-attracting and storage technology is engineered to capture and reduce moisture in your home, cottage or RV.

Bleach will kill mold

The article you referred to was from bobvila.com. It states that bleach will kill mold; however, it must come into contact with the mold spores and will not penetrate porous materials such as drywall. Therefore it will not completely kill mold spores that have gone into drywall and recommended a vinegar solution which will.

My article stated that most RVs do not have drywall and that bleach would kill mold on any hard surface material throughout the rig. I advised to have a professional look at the other materials.

Bob Vila’s article states:

To kill mold using vinegar, add the distilled white vinegar directly to a spray bottle without diluting it. Spray the affected area with the vinegar and let it sit for an hour to allow the vinegar to penetrate the surface and kill the mold at the root. Rinse the surface with warm water, spray again with vinegar, and allow to dry.

I think this would be good to use on carpets, upholstery, and ceiling fabric.

Hydrogen peroxide

Another suggestion was hydrogen peroxide.

Hydrogen peroxide is an antifungal, antiviral, and antibacterial solution used to prevent infection in wounds, so it’s found in most home medicine cabinets. However, it’s also a powerful mold killer, especially with solutions that have more than 3 percent of hydrogen peroxide concentration.

Hydrogen peroxide is best used on porous and non-porous surfaces, including clothing, bathroom items, and even kitchen appliances. However, as it’s a bleaching agent, ensure to spot test the area before cleaning to ensure the material won’t fade.

To kill mold using hydrogen peroxide, place undiluted 3 percent hydrogen peroxide solution into a spray bottle. Saturate the moldy area with the solution using the spray bottle and allow it to sit for 10 minutes. During this process, the hydrogen peroxide will kill the mold. Scrub the area with an abrasive sponge to ensure the entire area is clear of mold and allow the hydrogen peroxide to fade the mold stain. Finish by using a clean towel to dry the area.

As stated in my original post, it depends on the severity of the mold and comfort level of the owners. Obviously, Ingrid felt it was throughout the rig, so manually applying a spray to everything in the rig might not be the best solution. Getting a professional to conduct a complete mold mitigation treatment would be in her best interest.

However, the information regarding the use of vinegar and hydrogen peroxide is greatly appreciated and something I hope I never have to use!

 You might also enjoy this from Dave 

How to get rid of mold in and around RV toilet

Dear Dave,
Our RV toilet has been getting a black substance below the water line. When we flush, the water has a black tint to it. Then, within a few hours, the mold-like substance seems to grow on the surface of the flush ball and the china bowl below the water line. It brushes off easily but comes right back. It’s only happening in the toilet, not in any of the sinks or shower. Has anyone else ever heard of such a thing, and how did they get rid of it? —Roger, 2006 Montana 2955RL

Read Dave’s answer.

Dave Solberg is a leading expert in the RV industry and the author of the “RV Handbook.”

Read more from Dave here. 

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