Plenty of people clean the lint filter religiously and assume that’s the whole job done. The filter only catches a fraction of what your dryer produces — the exhaust vent itself, running from the back of the machine to the outside wall, accumulates lint that the filter never touches. Here’s how to clean it properly, without the common mistakes that damage the ducting.
What You Need to Clean a Dryer Exhaust Vent
- A dryer vent cleaning brush kit (flexible rods with a brush head — available from most hardware stores)
- A vacuum with a hose attachment
- A screwdriver (for disconnecting the vent from the dryer)
- A torch
- Gloves
How to Clean the Dryer Vent From the Inside
Step 1 — Unplug the Dryer and Move It Away From the Wall
Safety first, always. Unplug the unit (or switch off at the wall for hardwired units) and carefully pull it forward enough to access the vent connection at the back.
Step 2 — Safely Disconnect the Dryer Vent Hose
Most vent connections use a simple clamp or screw fitting. Loosen it and carefully detach the hose from the back of the dryer, keeping the hose oriented so any loose lint doesn’t spill immediately.
Step 3 — Vacuum Lint From the Dryer Exhaust Port
With the hose disconnected, use your vacuum’s hose attachment to clear lint directly from the dryer’s exhaust port — this area often has significant buildup that never makes it into the visible filter.
Step 4 — Brush and Vacuum the Flexible Vent Hose
Feed the brush rod through the disconnected hose section, working it back and forth to dislodge lint, then vacuum out what’s loosened. If the hose is a foil or plastic type showing wear, this is also a good moment to consider replacing it with rigid or semi-rigid metal ducting.
How to Clean the Dryer Vent From the Outside
Step 5 — Find the Exterior Dryer Vent Opening
Find where the duct exits the house — usually a wall or roof vent with a flap or louvre cover.
Step 6 — Remove the Exterior Vent Cover
Most exterior vent covers unscrew or unclip for access. Set screws aside carefully so reassembly is straightforward.
Step 7 — Brush the Dryer Vent From Outside In
Insert the flexible brush from the exterior opening, working it as far into the ducting as the rod allows, twisting gently as you go to dislodge compacted lint along the walls of the duct.
Step 8 — Vacuum the Dryer Vent From Both Ends
Once you’ve brushed through from both the dryer end and the exterior end, do a final vacuum pass from each end to clear any remaining loosened debris.
Step 9 — Reconnect and Reassemble the Dryer Vent
Reconnect the vent hose to the dryer, securing the clamp properly, reattach the exterior cover, and push the dryer back into position — leaving a small gap behind it rather than jamming it flush against the wall, which can crush the hose.
4 Dryer Vent Cleaning Mistakes That Can Cause Damage
1. Don’t Force a Rigid Rod Through the Vent
Metal ducting, particularly at joints and bends, can dent or separate under excessive force. Work the brush gently rather than forcing it through resistance.
2. Don’t Leave the Vent Clamp Loose
A loose clamp after reassembly means hot, humid air (and lint) escapes into the wall cavity or roof space instead of exiting outside — a fire and moisture risk that defeats the purpose of the clean.
3. Don’t Ignore the Full Length of the Dryer Vent
If your dryer vent run is long or has several bends — common in homes where the laundry has been relocated from its original position — a single cleaning pass from one end may not reach the middle sections. This is often where a professional service with longer, more capable equipment becomes worthwhile.
4. Don’t Ignore a Stuck or Blocked Exterior Vent Flap
While you have the exterior vent open, check that the flap moves freely. A stuck or lint-clogged flap restricts airflow even after the ducting itself is clean.
4 Signs You Should Call a Professional Dryer Vent Cleaner
- The vent run is long, has multiple bends, or you can’t determine its exact path
- Your brush kit doesn’t reach the middle of the duct from either end
- You notice signs of significant buildup (burning smell, very long drying times) despite basic cleaning
- The vent runs through a roof space or wall cavity you can’t safely access
Frequently Asked Questions — Cleaning a Dryer Exhaust Vent
How Often Should You Clean Your Dryer Vent Yourself?
Every 3–6 months for the DIY steps above, with a professional deep clean annually to reach sections a basic brush kit can’t access.
Can You Use a Leaf Blower to Clean a Dryer Vent?
It’s not generally recommended — the airflow can be too forceful for the ducting and doesn’t dislodge compacted lint the way a brush does, often just pushing it further along rather than removing it.
Should You Replace Plastic Dryer Vent Hose?
Yes, if you notice it’s plastic or vinyl rather than metal — this is a good opportunity to upgrade, since plastic hose is more fire-prone and prone to sagging and trapping lint.
What Should You Do If the Dryer Vent Hose Won’t Disconnect?
Don’t force a stuck or corroded clamp fitting — this is a sign it’s worth having a professional handle the disconnection and reconnection safely.
Conclusion
A proper dryer exhaust vent clean covers both ends of the run and the full length in between — cleaning just the lint filter, or just one end of the vent, leaves the majority of accumulated lint untouched.
Follow the steps above for a thorough DIY clean, and don’t hesitate to call in a professional for longer or harder-to-access vent runs.