Five Tips for Preventing Mold and Mildew in Your Front Loader

Front loading washers have experienced a surge in popularity in North America over the last ten years. They use less detergent, take up less space due to stackability, and are more efficient (cut energy consumption by 25% and water consumption by 33%) than their top-loading cousins. But, they do have a big disadvantage over top loaders: mold and mildew. If you own a front loader, you know what I’m talking about. That musty smell and unsightly black mildew that builds up in the seal and drum of your washer. And mold/mildew can be extremely toxic to your health—especially if it winds up on the clothes you wear or the sheets you sleep in every day. In my practice, I’ve seen the effects of toxic mold cause or aggravate a number of health ailments, including:

  • Chronic upper respiratory disease
  • Insomnia
  • Emotional disorders
  • Hormonal imbalance
  • And hyperactivity in children (to name but a few)

The good news is, you do not have to get rid of your front loader, nor do you have to resort to bleach or other toxic products to get rid of the mold. You can clean, disinfect, and prevent mold in your washing machine by following these tips:

Tip #1: Leave your washing machine door open to eliminate one of mold/mildews favorite food sources

Mold and mildew cannot grow in your front loader (or anywhere for that matter) without a food and water source. So, your first step is to remove the moisture from your washer by leaving the door open between washes. This will help your washer dry out and prevent mold from growing in the gasket around the seal of the machine. Easy enough, right?

Tip #2: Let your laundry detergent do double-duty by cleaning your clothes and preventing mold

To accomplish this, we recommend using Branch Basics Concentrate with Oxygen Boost in every wash. The natural cleaning, disinfecting, and anti-fungal properties of these two cleaners, coupled with leaving that washer door open between washes, will usually prevent mold and mildew from forming.

To use:

  • Pour 1 scoop of Oxygen Boost directly into the washer drum before adding your clothes
  • Add clothes
  • Pour 1 capful of Branch Basics Laundry Solution into the dispenser drawer
  • Run desired cycle
  • Leave the washer door open

Tip #3: Outsmart hidden mold by cleaning your washing machine seal and gasket

Since front loader washer seals and gasket are particularly prone to mold and mildew, it’s a good idea to clean them once per month. This is especially true for those of us who live in hot, humid climates, or if your washer and dryer are located in a basement.

Here’s how to clean your front loader washer seal and gasket:

  • Pull back the gasket
  • Spray with Branch Basics Bathroom Cleaner liberally
  • Let sit a couple of minutes
  • Then dip a microfiber or scrubbing brush in hot water and clean the sprayed area under the gasket
  • Use a microfiber cloth for the final wipe

Tip #4: Remove scale and detergent residue from your front loader or top loader

Detergent and scale residue are a prime food source for mold, and also put wear and tear on your washer. To prevent mold and extend the life of your front loading or top loading washer, I recommend descaling your washer periodically. And all it takes is a couple cups of plain old distilled white vinegar and a hot water wash cycle.

Here’s how to descale and clean your front loading washer with vinegar in one easy step:

  • Run 2 – 4 cups of white distilled vinegar through a full hot water washing cycle in any empty washer without detergent.

Repeat periodically, or once a month if you have very hard water. Now, if your washer is particularly dirty (like most everyone’s is since no one teaches us about descaling/disinfecting), repeat this step. If this still doesn’t do the trick, move onto Tip 5.

To descale and clean your top loader:

  • Fill with hot water, add 1-2 gallons of vinegar, and run for 10 minutes
  • Turn off the washer and let the solution stand overnight
  • In the morning, run your washer through a complete cycle
  • This will also help remove any mold that has infiltrated the drum

A Marilee Myth Buster: Vinegar is NOT appropriate for cleaning washing machines.

You may have read that white distilled vinegar should not be used in front loading washing machines because it could break down the seals. To put this myth to rest, I decided to call up Kenmore, Samsung, LG, Whirlpool, and Maytag to inquire. And guess what? Every single one of these companies heartily recommends using vinegar in their machines. Plus, many new washing machines now have a “clean washer” cycle where manufacturers recommend the use of white distilled vinegar to clean your machine.

Myth busted.

Tip #5: clean established or stubborn mold/mildew from your front loader

Follow tip 4 (above).

Next, spray drum and seal with distilled white vinegar, wait 5 minutes, scrub, and wipe with a damp microfiber cloth.

Follow the same procedure with 3% hydrogen peroxide.

If necessary, repeat entire process until no mold issue remains. Going forward, if you leave your washer door open and follow the tips above, you should not need to repeat this step again.

Why use vinegar and hydrogen peroxide together? Because they’re the most effective, least-toxic disinfectants available. In fact, studies have shown that vinegar and 3% hydrogen peroxide used in combination (in separate bottles) are more effective at killing germs than chlorine bleach or any commercially available kitchen cleaner,,,. We use them together because vinegar is good at killing some germs and hydrogen peroxide is better at killing others. Again, be sure to store them in separate bottles, as combining them into one solution creates harmful fumes. They will not create harmful fumes if sprayed independently, just if mixed together as a solution.

Bonus Tip: Washing Machine Mold can be prevented by Ditching conventional fabric softener

The ingredients in conventional fabric softeners are not only toxic to your health, but their sticky, slippery residue is like an all-you-can-eat buffet for mold and mildew. As a non-toxic, mold-free alternative we recommend 100% wool dryer balls which naturally soften all types of clothing without leaving any toxic residue.

To recap how to clean and prevent mold and mildew in your front loader:

  • Leave your washer door open between cycles
  • Use Branch Basics Concentrate and Oxygen Boost with every load
  • Clean your seal and gasket once per month
  • Remove scale and detergent residues using distilled white vinegar
  • For really dirty washers, do the added step of spraying distilled white vinegar and peroxide until all the mold is gone
  • Opt for natural wool dryer balls instead of conventional fabric softener.
  • Follow these tips, and you’ll enjoy squeaky clean, mold-free, toxin-free laundry (and longer lasting appliances) from now on. Happy front-loader cleansing!


Articles on Dr. Susan Sumner’s original research work appeared in the scientific news journal, “Science News,” in issues that were published on August 29, 1996, and on August 8, 1998.

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  1. In step 2 when you say to use branch basics and oxygen boost with every load, does that replace the need for detergent or do you use that in addition to detergent?

    1. Hello Michelle. This combo replaces your detergent. If you have any other questions, just ask!

  2. In tip #5 you recommend using white vinegar and hydrogen peroxide together, are you meaning to pour white vinegar and hydrogen peroxide into the same water in a washing machine at the same time? Or are you meaning to put the white vinegar in one time and hydrogen peroxide at a different time? How much of each for a top loading washing machine?

    1. Hi Kim.

      Put the vinegar in a spray bottle and the hydrogen peroxide in a different spray bottle, and then spray and wipe the drum of the machine with each one. They can be one right after the other. I hope this answers your question.

  3. For tip #4, When cleaning your washing machine with vinegar on the cleaning cycle, where do you pour the two cups of vinegar? In the drum? It seems like 2 cups would be too much to place in the detergent compartment.

  4. To descale and clean your top loader:
    I have a top loader and am confused by the steps to Descale and Clean. What is exactly meant by “fill with hot water”? Does that mean fill the entire washer drum with hot water and then add 2 gallons of vinegar to the drum as well? Thank you!

    1. Hi Lauren.

      Thanks for your question! Set the machine for a large load on hot, and let the drum of the machine fill, and then add the vinegar to the drum as well. There was a mistake in the directions (great catch!) – It should say to add 2 CUPS of vinegar rather than 2 gallons. We will correct the article.


  5. Just the piece I was looking for! Our (front-loader) washing machine instructions recommend cleaning it with bleach in a special cycle every month. I hate bleach, so this is just the solution I need to keep it clean and keep our clothes smelling fresh! Thank you!

  6. Hi! I can see mold in my seal/gasket. Does that stain? My husband says it does.

    I’ve done all these things and still see it. How do I know it’s gone?


    1. HI Rivkah, yes mold can stain. Make sure to thoroughly and properly clean to help prevent it from returning. May need to clean it a few times.


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