TL;DR
Pull the lint screen and clear it after every single load -- that is the whole daily job, and it takes five seconds. A few times a year, wash the screen with hot soapy water to remove the invisible film left by dryer sheets, and vacuum the housing the screen sits in. Failure to clean is the leading contributing factor in home clothes dryer fires. Source: National Fire Protection Association
What the lint screen is doing
A dryer works by pulling heated air through tumbling clothes and out an exhaust duct. That moving air carries away moisture -- and it also carries away fiber shed by the fabric. The screen catches the fiber so it does not pack the duct.
Which means the screen is a restriction by design. A clean screen restricts airflow a little. A loaded screen restricts it a lot. And a screen with an invisible film on it restricts airflow even when it looks perfectly clean.
How do you clean a dryer lint trap?
Pull the screen straight out after every load and wipe the lint off with your fingers into the trash. Two or three times a year, wash the screen with hot water, dish soap and a soft brush to strip off dryer sheet film, dry it completely, and vacuum the slot it sits in.
The five second version, every load
Every load. Not most loads.
Slide the screen out, roll the lint mat off with a fingertip, and drop it in the trash. Do not rinse lint down a sink -- it clogs traps. Slide the screen back in fully seated before the next load, because running a dryer with the screen out lets lint go straight into the blower housing and the duct.
If the lint mat is thin and patchy, that is normal for synthetics. Towels and new cotton shed heavily and will produce a thick mat.
The part almost nobody does: wash the screen
Dryer sheets work by melting a thin coating of fabric-softening compound onto fabric in the heat of the drum. Some of that coating lands on the lint screen instead. Over months it builds into a transparent film that you cannot see and can barely feel.
That film blocks airflow through the mesh even after the lint is removed. The result is longer drying times, a hotter dryer, and more strain on the machine.
The water test. Pull the screen, hold it over a sink, and pour water on it. Clean mesh lets water pass straight through. If water beads up or pools on the screen, there is film on it.
To strip it: hot water, a drop of dish soap, and a soft nylon brush on both sides. Rinse until water runs straight through, then let the screen dry completely before putting it back. Do this two or three times a year, or more often if you use dryer sheets on every load. See do dryer sheets leave residue and dryer sheets versus wool dryer balls if you want to stop the film at the source.
Vacuum the housing under the screen
Lint escapes around the edges of the screen and collects in the slot below it. Over years, that becomes a packed wad sitting directly in the airflow path.
Once or twice a year, unplug the dryer, pull the screen, and vacuum the slot with a crevice tool or a long narrow lint brush made for the job. Go as deep as the tool reaches. Do not push lint further down with a stick -- that just packs it into the blower.
Why this matters more than it sounds
Dryer fires are a documented and preventable hazard. Failure to clean the dryer is the leading contributing factor in home clothes dryer fires, and dryers cause thousands of reported home structure fires each year in the United States. Source: National Fire Protection Association
Restricted airflow is the mechanism. Less air out means more heat inside, and lint is highly combustible. The screen is the first line of defense, but it is not the main one. The exhaust duct matters more than the screen -- lint that gets past the screen accumulates in the duct where nobody sees it, and that is where most dryer fires start. Cleaning the screen religiously while ignoring the duct is the common mistake. Clean the dryer vent duct at least once a year.
Signs your screen or duct is restricting airflow
- Loads that used to dry in one cycle now need two. Start with why clothes take two cycles to dry.
- The dryer cabinet or the clothes are unusually hot at the end of the cycle.
- The laundry room feels humid or smells musty while the dryer runs.
- Lint is appearing around the door seal or behind the machine.
- The outside vent flap barely opens when the dryer is running.
Any of those means airflow, not the heating element.
What not to do
Do not run the dryer without the screen in place. Do not use the screen if the mesh is torn -- replace it. Do not put the screen back wet, because damp mesh grabs lint immediately. Do not use a stiff wire brush, which stretches and tears the mesh. And if something melted or leaked inside the drum, handle that separately -- see clean residue inside the dryer drum.
FAQ
How often should I clean the lint trap?
After every load, without exception. That is the routine job. Separately, wash the screen with hot soapy water two or three times a year to remove dryer sheet film, and vacuum the housing beneath it once or twice a year.
Do dryer sheets really clog the lint screen?
Yes. The softening compound melts in the drum heat and some of it deposits on the mesh, forming a clear film that blocks airflow. The film does not look like anything, which is why the water test is useful -- clean mesh passes water instantly.
Is it dangerous to run the dryer with a full lint trap?
It is a real risk, not a theoretical one. A loaded screen restricts airflow, which raises internal temperature and pushes more lint past the screen into the duct. Failure to clean is the leading contributing factor in dryer fires, so treat it as a safety step rather than housekeeping.
Can I put the lint screen in the dishwasher?
Do not. Dishwasher heat can warp the plastic frame, and detergent film can leave its own residue on the mesh. Hand washing with hot water, dish soap and a soft brush takes two minutes and does the job without the risk.
Where does the lint go if the screen does not catch it?
Into the blower housing and the exhaust duct, where it accumulates on bends, on the flapper at the outside vent, and anywhere the duct is crushed or sagging. That accumulation is the main fire risk, which is why the duct needs its own annual cleaning.
Why is there lint on my clothes even with a clean screen?
Usually because the load mixed heavy shedders with lint magnets -- new towels with dark synthetics, for example -- or the load was overpacked so the tumbling could not shake fiber loose. Sorting by fabric and drying smaller loads fixes most of it.
For the whole-home version of this work, see house cleaning services.
If the laundry room needs more than a lint screen and a vacuum, that is a reasonable thing to hand off. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote and we will walk you through it.