Brush the grille dry with a soft non-metal brush held at an angle, so lint sweeps sideways out of the slots instead of packing in deeper. Lift what came loose with adhesive putty or low-tack tape. Then play a tone that sweeps low to high at full volume for about fifteen seconds. Never poke a pin into the mesh.
The metal slots you can see are not the speaker. Behind them sits a fine mesh, and behind that the driver. Pocket lint packs into the slots and into the weave of that mesh, shrinking the open area that air can move through. That is why a dusty speaker goes quiet and dull rather than silent, and why it degrades in slow steps instead of all at once — every trip in and out of a pocket presses the same lint a little tighter.
There are really two piles of dust and they need opposite treatments. The grey felt sitting in the slots is surface lint: a brush and something sticky remove it, and you can watch it happen. The much finer powder that already worked its way past the mesh and settled on the diaphragm is beyond the reach of any tool you can safely put near a phone. So the order is physical first, vibration last.
A single steady note is a weak tool against dust. A low tone moves the diaphragm a long way slowly; a high tone moves it a short way very quickly. Particles differ in size and in how stubbornly they cling, so sweeping through the whole band gives many more chances to shake one loose than holding one frequency does. That is the real difference between a water tone and a dust sweep — they are not interchangeable.
A fair number of 'muffled' phones turn out to be a case whose speaker cutout has shifted or silted up. Pull the case off, play something, and listen again. Then shine a light into the grille: surface lint shows up as grey felt sitting in the slots. This one look tells you which of the next steps matters. If you can see it, brushing and lifting will do most of the work; if the slots look clean and it still sounds dull, the problem is already past the mesh.
Use a soft, non-metallic brush — a clean dry toothbrush, a soft paintbrush, or a camera lens brush. Android Authority's cleaning guide puts it the same way: 'Using a soft-bristled brush, such as a clean toothbrush or paintbrush, gently clean your phone's speaker grilles.' Hold the phone so the grille points at the floor and brush along the slot rather than into it. The angle is the whole trick: pressing straight in packs lint deeper, brushing across walks it to the edge where gravity takes over. Keep everything dry — a damp cloth turns loose dust into paste and leaves its own fibres behind.
Warm a small piece of adhesive putty between your fingers until it is soft, press it gently onto the grille, then peel it away slowly. Repeat with a clean face of the putty until it stops coming up grey. Painter's or masking tape does the same job. Two cautions: press, do not mash — forcing putty into the holes leaves some of it in there — and skip strong packing tape, which can leave adhesive in the slots that then collects more dust than you removed.
Turn media volume to maximum, unplug earphones and switch Bluetooth off so the sound really comes out of the speaker you are cleaning. Hold the grille facing down and play a tone that rises continuously from a couple of hundred hertz up into the kilohertz range, for about fifteen seconds. Then tap the back of the phone firmly against the heel of your palm a few times, still pointing down. This is the only step that does anything to particles already behind the mesh, because the only thing that can move them is the diaphragm they are sitting on.
Judge with the same clip every time, and make it speech rather than music — a voice recording exposes dullness far better than a song does. If each round sounds a little brighter, do another. If two rounds in a row sound identical, stop: what is left is packed into the weave of the mesh or is a problem with the driver itself, and neither gets better with more brushing or more volume.
This page was written by DKsequence. We also make the Android app recommended below — the steps above work whether or not you install it.
Better not. The pressure can drive debris further in instead of out, and canned air can spit propellant liquid into the opening — Android Authority warns you 'could also force dirt further into your phone, or spray some of the can's liquids.' A soft brush plus adhesive putty gets the same lint out with no pressure at all.
No, and it is the one irreversible mistake on this list. Behind the slots is a fine mesh whose entire job is keeping dust and water off the driver. A pin can tear it, a tear does not repair itself, and afterwards the speaker takes in dirt faster than before. Anything you push through also lands exactly where you cannot retrieve it. Android Authority says it plainly: 'Don't use a bent paperclip, sewing needle, pins, or other any sharp object.'
Use them on the body if you like, but keep them off the opening. Apple's cleaning guidance for iPhone is a soft, slightly damp cloth that sheds no lint — and in the same breath, “Avoid getting moisture in openings.” Moisture turns loose dust into a paste that sets in the mesh, and alcohol near interior components is a bad trade. Everything that touches the grille itself should be dry.
When you notice it, which for a phone that lives in a pocket tends to mean every couple of months. There is no benefit in running cleaning tones daily: extended maximum-volume playback stresses the driver, and dust that is not there yet cannot be removed in advance.
Compare the two outputs if your phone has them — hold it to your ear like a call and listen to the earpiece, then play something through the bottom speaker. If only one is dull, the cause is mechanical: packed mesh or a tired driver, which is a repair-shop question. If both are dull, check that audio is not going out to a Bluetooth device and that no volume limiter or sound preset is switched on.