If your freshly washed clothes come out of the dryer smelling musty, you’re not alone. Many homeowners don’t realize that dryers can develop strong mildew odors when moisture becomes trapped inside the system. As one of the leading providers of Denver appliance repair, High City Appliance sees this problem every week in homes across Denver, Aurora, and nearby cities. The good news is that the cause is usually simple, and with the right cleaning steps, you can eliminate the smell and prevent it from returning.
A dryer’s primary job is to remove moisture, but when something blocks the airflow or residue builds up, the drum becomes a breeding ground for mildew. Understanding where that smell comes from is the first step to getting rid of it—and keeping your laundry fresh.
Why Does Your Dryer Smell Like Mildew?
A dryer is supposed to remove moisture from clothes—but under certain conditions, it can trap moisture instead. When water cannot properly evaporate or buildup occurs inside the drum, vent, or lint trap, it creates the perfect environment for mildew growth.
The most common causes include:
1. Blocked or dirty lint trap
When lint clogs the screen, airflow slows down. This causes moisture to stay trapped inside the dryer, eventually leading to musty odors.
2. Poor ventilation
If the dryer vent is kinked, clogged, or full of lint, it cannot carry moist air outside the home. This is one of the biggest reasons for strong mildew smells.
3. Wet clothes left in the dryer
Leaving damp laundry inside for hours or overnight gives mildew time to develop.
4. Detergent and fabric softener residue
These products can accumulate inside the drum, especially with scented softeners, creating a sticky environment where odors cling.
5. Internal mold in the vent system
If your vent duct contains moisture, mold can begin to grow inside the walls of the tube. This requires heavier cleaning or professional service.
Step-by-Step Guide to Removing Mildew Smell
Below are the most effective methods our technicians recommend to homeowners dealing with dryer odor.
1. Deep-clean the lint trap
Start by removing the lint screen and washing it with warm water and dish soap. Even if it looks clean, residue can coat the mesh and block airflow. Let it dry completely before reinstalling.
2. Clean the dryer drum with vinegar and water
Mix equal parts white vinegar and warm water. Use a soft cloth to wipe down the drum, the inside of the door, and the rubber seals. Vinegar naturally kills mildew and neutralizes odors.
You can also run the dryer empty on high heat for 10–15 minutes afterward. Heat helps kill any remaining bacteria.
3. Clean the moisture sensor
Most modern dryers have a moisture sensor near the inside edge of the drum. If it’s dirty, it can cause wet laundry to stay inside longer than necessary. Wipe it gently with rubbing alcohol.
4. Clean or replace the dryer vent
This is the #1 fix for stubborn mildew smells.
Remove the vent hose from the back of the dryer and vacuum out the lint. If the vent is flexible and covered in residue, it may need replacement. Ideally, homeowners should have their dryer vent cleaned professionally every 6–12 months.
This step also greatly reduces fire risk, making it worth the time and effort.
5. Check for standing water or leaks
If water is leaking inside the dryer or vent, mold will continue to grow no matter how much you clean. A technician may be needed to inspect the system for internal issues.
Preventing the Smell from Coming Back
Once the odor is gone, the next step is making sure it never returns. Here are the top prevention tips from High City Appliance technicians:
- Always clean the lint trap before every drying cycle
- Keep dryer vents professionally cleaned
- Avoid leaving wet clothes inside the dryer
- Leave the door slightly open when not in use to improve airflow
- Don’t overload the dryer—this traps moisture
- Use less fabric softener to reduce buildup
With consistent maintenance, mildew smells are easy to avoid.
When to Call a Professional
While basic cleaning works for most cases, sometimes mildew smell comes from deeper inside the appliance or the vent system. If the odor returns quickly or you suspect a ventilation problem, it’s best to call professionals. Issues like mold inside the vent duct, motor moisture, or internal blockages require trained experts for safe repair.
If you need Denver appliance repair, High City Appliance is ready to help. Our team specializes in solving dryer odor issues, vent blockages, heating problems, and full-system diagnostic work. We serve Denver, Aurora, Englewood, and all nearby cities.
Final Thoughts
A mildew smell coming from your dryer is more than just unpleasant—it’s a sign that your appliance needs attention. With simple cleaning steps and regular maintenance, you can eliminate the odor and extend the lifespan of your
