If you have never looked closely at the grille above your shower, it is probably wearing a grey coat of fluff. Learning how to clean exhaust fan covers and blades properly takes about half an hour, and it makes a real difference to how quickly your bathroom dries out after a shower. This guide walks you through switching off the power safely, taking the cover down, cleaning each part, and putting it back, plus the warning signs that mean you should stop and call a licensed electrician instead.

In Singapore the stakes are higher than in a cooler, drier country. Our air is humid all year, many HDB and condominium bathrooms have small or no windows, and a bathroom that stays damp for hours after every shower is exactly where mould settles into grout, ceilings and sealant. The exhaust fan is often the only thing moving that moist air out.

Why a dusty exhaust fan matters in a Singapore bathroom

An exhaust fan has one job: pulling warm, wet air out of the bathroom before it condenses on the ceiling, mirror and walls. Dust and lint build up on the grille and blades quickly, because the fan draws in fibres from towels and clothes along with the steam. The moisture in that air makes the dust sticky, so it clings and layers rather than blowing through.

Good bathroom ventilation in a humid climate is mostly about time. A bathroom that dries quickly gives mould little chance; one that stays damp until the next shower gives it a home. A clean fan is the cheapest way to shorten that drying time.

A quick test before you start

Switch the fan on and hold a single sheet of tissue paper flat against the grille. A healthy fan should hold the tissue against the cover. If it slides straight off, the fan is clogged or struggling. Repeat the test after cleaning.

Safety first: power off before you touch anything

Switch off the power. Turn the fan off at its wall switch. If your fan is wired directly into the ceiling rather than plugged into a socket, also switch off the relevant circuit at your distribution board if you know which one it is. Never rely on the fan simply being silent.
Let it stop and cool. Wait until the blades have stopped turning completely and the motor housing is no longer warm.
Keep your hands and the area dry. Do not work on the fan straight after a shower, when the ceiling and fittings are still wet. Choose a time when the bathroom has dried out.
Use a stable step. Bathroom floors are slippery. Use a sturdy step stool or ladder with non-slip feet on a dry floor, and avoid standing on the toilet seat, the edge of the bathtub or a plastic stool.
Never spray liquid into the motor. Water or cleaning spray in the motor or wiring is the main way this job goes wrong. Only the cover goes into water.

Singapore’s Energy Market Authority (EMA) says work that draws a new connection from a circuit, or shifts or extends an electrical point, must be done by a Licensed Electrical Worker. See its answers to common electrical safety questions. Cleaning the cover and blades is household maintenance. Opening the motor housing or touching wiring is not.

What you need to clean a bathroom exhaust fan

A step stool or small ladder with non-slip feet
A vacuum cleaner with a brush attachment and a crevice tool
A soft, dry paintbrush or an old, clean toothbrush
Two microfibre cloths, one damp and one dry
A basin or sink of warm water with a little mild dishwashing liquid
A screwdriver, if your cover is screwed in
Gloves, safety glasses and a dust mask

Skip harsh solvents, abrasive pads and strong bleach on the cover. Most grilles are plastic, and warm soapy water is enough.

How to clean exhaust fan covers and blades, step by step

Models differ, so check the manual if you have it. This method suits the typical ceiling-mounted fan.

Turn off the power. Switch off at the wall switch, and at the distribution board if the fan is hardwired. Confirm the fan does not start when you flick the switch.
Vacuum the grille in place. Before removing anything, run the brush attachment over the cover. This stops most of the dust raining down on you.
Remove the cover. Many covers are held by two spring clips. Pull the cover gently straight down a few centimetres, then squeeze the metal clips together to release them from their slots. Others are held by a central screw or screws at the corners. Never force or twist it, as the clips break easily.
Wash the cover. Soak it for ten to fifteen minutes in warm water with a few drops of dishwashing liquid. Scrub the slats with the toothbrush, rinse, and leave it to dry completely.
Brush the blades and housing. With the cover off, use the dry paintbrush to loosen dust from each blade, working from the centre outwards, and catch it with the vacuum crevice tool held just below.
Wipe, do not wet. Wrap the damp microfibre cloth round a finger, well wrung out so it is barely moist, and wipe each blade and the inside edge of the housing. Follow with the dry cloth, keeping moisture away from the motor and wiring.
Check what you can see. Look for loose wires, scorch marks, melted plastic or rust inside the housing. If you see any, stop and call an electrician.
Refit the cover. Once the cover is fully dry, squeeze the clips, slot them back into place and push the cover up until it sits flush with the ceiling. Replace any screws without overtightening.
Restore power and test. Switch the power back on, run the fan, and repeat the tissue test. It should grip noticeably better than before.

If the cover will not come off

If the grille is fixed in place, vacuum the grille thoroughly with the brush attachment, then wipe each slat with a barely damp cloth while the power is off. If reaching the fan means opening a ceiling panel, leave that to a contractor.

How often to clean it, and the routine in between

There is no official schedule. As a practical starting point, many households give the grille a quick vacuum every month or so and do the full cover-off clean every few months. If you can see a grey film on the slats, it is due.

Small habits keep the build-up down between cleans:

Run the fan throughout every shower and leave it on for a while afterwards until the mirror has cleared.
Keep the bathroom door closed while the fan runs, so it pulls air from the bathroom rather than the rest of the flat, then open the door afterwards to help it dry.
Squeegee or wipe down shower screens and walls after use, so the fan has less water to remove.

Add the fan to your periodic chores alongside the shower head; our household cleaning schedule shows one way to fit these jobs in.

Using bathroom ventilation to keep mould away

If you already have black spots on the ceiling or in the corners, cleaning the fan will slow new growth but will not remove what is there. Treat the existing mould with a suitable method first, working with the window open and the fan running. Our guide on removing mould from a bathroom ceiling safely covers that in detail, and our full bathroom cleaning guide covers the weekly routine.

One important warning applies whenever you clean a bathroom with chemicals. Never mix bleach with ammonia-based cleaners or with acidic products such as descalers or vinegar, because the combination can release toxic gases. Use one product at a time, ventilate, and test on a hidden spot first.

When to call an electrician instead

Cleaning solves dust, not electrical or mechanical faults. Stop, switch the fan off and contact a Licensed Electrical Worker if you notice any of the following:

A burning or hot plastic smell when the fan runs
Sparks, scorch marks, or melted or discoloured plastic around the fan or switch
The fan trips your circuit breaker, or the residual current circuit breaker trips when it is switched on
Loud grinding, rattling or screeching that continues after cleaning
The fan hums but the blades do not turn, or turn very slowly

Replacing a fan motor, rewiring a fan or installing a new fan where there was none are all electrical work. If you live in an HDB flat and the problem seems to involve the building rather than your own fittings, such as water seeping from the ceiling, contact your town council or HDB for advice. Femme5 provides home cleaning, and we do not carry out electrical work, plumbing or repairs.

Frequently Asked Questions

Can I wash the exhaust fan cover in the sink?

Yes, the removable plastic cover can be soaked in warm water with a little dishwashing liquid, scrubbed with a soft brush and rinsed under the tap. It must be completely dry before you refit it. Never put the motor or any part with wiring into water.

Do I need to switch off the power at the main board?

At the very least, switch the fan off at its wall switch and confirm it does not start. If the fan is wired directly into the ceiling, it is safer to also switch off its circuit at your distribution board while you work on the blades.

Why is my exhaust fan still noisy after cleaning?

Dust on the blades can cause rattling that cleaning will fix. If loud grinding, screeching or humming continues after a thorough clean, the motor or bearings may be worn or the fan may be loose in its housing. That is a repair job, so switch it off and ask a Licensed Electrical Worker to inspect it rather than taking the motor apart yourself.

How long should I run the bathroom exhaust fan after a shower?

Run it throughout the shower and keep it going afterwards until the mirror has cleared and the walls look dry. There is no fixed official figure, so judge by the room rather than the clock, and in a bathroom without a window err on the longer side. A fan on a timer switch makes this easy.

Will cleaning the exhaust fan get rid of mould?

Cleaning the fan will not remove mould that is already growing on ceilings or grout, but it helps the bathroom dry faster, which slows new growth. Treat existing mould separately, with the room well ventilated and without mixing cleaning chemicals, then keep the fan clean and run it after every shower to stop the mould coming back.

Conclusion

A bathroom exhaust fan is easy to forget because it still sounds fine when clogged. Thirty minutes with the power off, a vacuum, a soft brush and a basin of soapy water restores its airflow and helps your bathroom dry faster in Singapore’s humidity. Keep moisture away from the motor, never force the cover, and give the grille a quick vacuum between deeper cleans. Above all, know where cleaning stops. Burning smells, sparks, tripping breakers and grinding motors are signs for a Licensed Electrical Worker, not a cloth.

If your bathroom needs more than a quick fan clean, we can take the routine work off your hands. Femme5 also offers home cleaning in Singapore by the hour and deep cleaning for kitchens and bathrooms. Message our team for a quote.

The Femme5 Team
Home cleaning team, Femme5 Agency
Femme5 provides part-time home cleaning, deep cleaning and post-renovation cleaning for HDB flats, condominiums and landed homes across Singapore.

Femme5 Cleaning Team

Written by the home cleaning team at Femme5 Agency Pte Ltd, which provides part-time home cleaning, deep cleaning and post-renovation cleaning across Singapore.

How to Clean a Bathroom Exhaust Fan Safely