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HOW-TO GUIDEHow to Clean a Leaf Blower: A 20 Minute Service Routine That Keeps Airflow Strong
Cleaning a leaf blower comes down to three things: clearing the air intake vents, clearing the tube and impeller housing, and getting damp leaf debris off before it dries into a crust. Do those with the battery out or the plug pulled and you will recover most of the airflow a tired blower has lost. Twenty minutes with a brush and a cloth covers it.
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A leaf blower is a fan in a shaped housing. It pulls air in through vents on the body, accelerates it with an impeller and pushes it out of a narrowing tube. Anything restricting the intake cuts how much air the impeller can move, and half-blocked vents take a bigger bite out of the airflow at the nozzle than most people expect.
Wet leaf pulp is the usual culprit. It gets sucked against the intake grille, dries there overnight and sets like papier mache. On cordless machines there is a second problem: blocked vents mean the motor runs hotter, which shortens runtime per charge.
Before you touch anything
- Cordless: remove the battery pack completely. Not just switched off, removed.
- Corded: unplug it at the wall and keep the plug in sight.
- Petrol: let the engine cool fully, then disconnect the spark plug cap before going anywhere near the impeller.
Impeller blades are thin and sharp, and a blower that starts while your fingers are in the housing is a trip to A and E. Wear gloves: dried leaf matter hides grit, thorns and the odd bit of glass off a driveway.
Kit is minimal. A stiff bristle brush, an old toothbrush for the vents, a damp cloth and a dry one, and compressed air if you have it.
Step by step
1. Knock off the loose debris outside
Take the machine over a bin, tap the housing gently and brush the shell down dry. Doing the dry pass first stops you turning dust into paste that works into the seams.
2. Clear the intake vents
These are the slots or mesh panel on the body, usually near the motor and often partly hidden under the handle. This is the single most important part of the job. Work the brush along the slots rather than across them, then blow compressed air from inside to outside wherever you can reach, so the blockage comes back out instead of being driven deeper into the motor.
3. Detach and clear the tube
Pull the tube or tubes off and check inside. Twigs and compacted leaf matter lodge at the joints and at any narrowing near the nozzle. A length of dowel pushed through shifts most of it. Wash the tube out with warm soapy water if it is caked, then dry it fully before refitting.
4. Inspect the impeller housing
With the power disconnected, look into the housing through the tube opening. Turn the impeller by hand, check for chipped or bent blades and pick out wrapped grass or plastic. A damaged impeller is worth replacing, because an unbalanced fan vibrates and that vibration works through the bearings.
5. Do the vacuum side too
If your machine also vacuums and mulches, empty the collection bag and turn it inside out. Bags clog invisibly: the fabric pores block with fine dust and suction drops while the bag still looks clean. Rinse it and hang it to dry, and check the mulching blades while you are there.
Quick Tip
Run the blower on full power for thirty seconds before you put it away. It clears loose debris while everything is still dry and stops damp leaf pulp curing onto the intake grille overnight. That one habit halves the cleaning you will need later.
6. Battery contacts and the pack itself
Wipe the terminals on both the tool and the battery with a dry cloth. Dust and moisture on contacts cause intermittent cut-outs that get blamed on a failing battery far too often. No water, no contact cleaner, and never poke metal into the terminal slots. Check the pack's own vents too.
Petrol blowers: three extra jobs
Petrol machines add an air filter, a spark plug and cooling fins to the routine. Foam filters wash in warm soapy water, squeezed out rather than wrung, then dried fully and lightly re-oiled if the manual asks for it. Paper filters get tapped clean or replaced, never washed, and a clogged one makes the engine run rich: poor starting, lost power under load. Check the spark plug electrode as well, where light tan is healthy and black and sooty points back at the filter or fuel mix. Wipe the cylinder cooling fins, because trapped grass there causes overheating that gets blamed on the carburettor.
What not to do
Do not pressure wash a leaf blower. It is tempting after a big autumn clear-up, but water gets past the seals into the motor, switch and bearings, and the damage often does not show for weeks. Keep water off the intake vents entirely. Skip solvents and aggressive degreasers on the housing too, since they cloud and embrittle the plastic.
How often is enough
A quick brush down after every use, five minutes of intake and tube clearing every few sessions, and one proper strip and clean at the end of the leaf season. Gravel drives and wet weather load the machine faster than a dry lawn, so bring that clean forward if it is your usual ground.
Before storage, get everything bone dry, remove the battery and keep the pack separately at a partial charge somewhere cool. Petrol machines should be run dry or given fuel stabiliser. Hang the blower rather than standing it on damp concrete.
Can I wash a leaf blower with a hose?
Only the detached tube and the collection bag. Keep the hose away from the main body, because water entering the intake vents reaches the motor and switchgear directly. Use a damp cloth on the housing instead.
My blower feels weaker than it used to. Will cleaning fix it?
Very often, yes. Blocked intake vents and a partly clogged tube are the two most common causes of gradual power loss. Clean both and test again. If it is still weak, check the impeller for damage and, on cordless models, the battery's remaining capacity.
Do I need to oil anything after cleaning?
Most cordless and corded blowers have sealed bearings and need no lubrication. Petrol two-stroke models take theirs from the fuel mix. The only routine oiling is a foam air filter, and only if the manual specifies it.