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If your clean laundry stinks, the problem could be mold and bacteria. Here's how to kill it.

Katie is a Writer at CNET, covering all things how-to. When she's not writing, she enjoys playing in golf scrambles, practicing yoga and spending time on the lake.

This story is part of Try This , CNET's collection of simple tips to improve your life, fast.

Washing your clothes, towels and bedding weekly is likely on your to-do list each week, but what about cleaning your washing machine? If that has yet to be added to your list, there's a good reason to start today.

Your washer could be harboring mold and mildew, leaving your machine gunky and your laundry smelling less than fresh. Your washer needs a good scrub on a regular basis -- especially if there's a sulfur smell in your laundry. The good news is if there's already mold growing in your washing machine, you can kill it and prevent it from coming back.

I'll explain how to get your clothes and washing machine smelling fresh and clean again, and how to keep the bad smells away in the future. Plus, I'll show you how to spot the gross gunk, clean it out and ward off bacteria for good. (We've also got plenty more tips for how to get pet stains out of carpets , how to remove makeup stains from your bedding , and how to clean your mattress .)

Read also: Do Your Laundry This Way and Save Money on Your Energy Bill

If you've got mold in your washer, here's how to get rid of it:

1. Start by putting on gloves and grabbing an old towel that you don't care about.

2. Mix a solution of either bleach and hot water OR vinegar and hot water. Never mix bleach and vinegar together, as it creates a chlorine gas that can be harmful to you.

3. Dip the towel in the mixture and start scrubbing away at any visible mold. Make sure to hit the detergent dispenser and around the gaskets.

4. If there's a gasket around the door (front-load washers have them), carefully and thoroughly clean and dry it, including all the folds.

5. Run a wash cycle on the hottest setting your machine offers with a cup of bleach or vinegar. (Not both!) If using bleach, pour it in the compartment designated for bleach. If using vinegar, pour it in the detergent slot. If your machine has a self-clean cycle, you can use that setting. This should kill any hidden mold that you may have missed.

6. Next, use another old towel and wipe away all the moisture in your washing machine. This includes the drum, dispensers, seals and any other areas you can reach.

7. Lastly, leave the door to your washer open to allow air circulation to dry out any parts you missed. Doing this monthly will help prevent mold growth.

Mold grows in dark, moist areas, which is what your washer becomes after you've unloaded the clothes. Keeping the lid closed traps moisture, which can lead to built-up bacteria and a bad smell. Instead, leave the door open to help ventilate the washer and prevent mold from growing in the first place. 

When you're planning to throw a load of laundry in, make sure you'll be home to remove the clothes when the timer goes off. That means don't start the washer before going to work or to bed. Not only does this prevent mold from growing in your washer, but it keeps your clean clothes from mildewing.

After you're finished using your washing machine for the day, make sure to wipe down any part of the washer that's damp. This includes the lid, drum, door, rubber gaskets and detergent dispenser (if your machine has that feature). Keep an old towel on hand for this purpose.

Make sure to dry the seals along with the rest of your washer to prevent moisture from sticking around. And while mold contamination can happen in any washer, it's especially common in high-efficiency (aka HE) front-loading washers. That's why you should regularly wash the gaskets and seals around the door and keep them dry. The gaskets make sure water doesn't leak out around the door and also do a good job of sealing in the moisture that can help mold grow. You should also remove pet hair, crumpled paper or any other dirt in your washing machine right away. 

Read more: How to Buy a Washing Machine

If you're using an HE washer, it's best to use a detergent made for HE washing machines. 

Liquid detergents can leave a residue in your washing machine, giving mold a food source. So if you have an HE washer, the first thing to do to keep mold in check is to make sure you're using a laundry detergent made specifically for this type of washer, which will produce fewer suds. (Look for the letters HE on the soap container.) Better yet, steer clear of liquid detergent and switch to powder detergent or pods. And whichever you choose, make sure you're using only as much as you need to wash your clothes. If you use too much, your clothes may have a smell and residue.

Once you've cleaned your washer, it's time to move on to the rest of your house. Start with the bathroom: Here's a simple one-hour science hack for degunking your showerhead , and here's how to unclog a toilet without a plunger .