The name promises more than any sound-based tool can deliver, so it is worth being precise about the scope.
For a complete overview, see how to clear liquid from a speaker.
What it genuinely does
It plays a low-frequency tone through your device's own speaker. That tone moves the diaphragm through its
full travel, and each stroke pumps air against whatever is sitting in the speaker cavity — pushing trapped
liquid and loose debris out through the grille. Gravity carries it away, which is why orientation matters.
Why "fix" is only half accurate
It removes obstructions. It repairs nothing. A speaker that is muffled because of water or lint will sound
normal again once cleared — that feels like a fix and is a genuine restoration of lost performance. A speaker
with a torn diaphragm, a corroded contact or a broken cable is unaffected, because there is nothing to
remove.
The distinction that matters
Blockage sounds muffled but complete — quieter and duller, but nothing missing and nothing
rattling. Damage sounds different: buzzing that worsens as volume rises means a torn diaphragm; total silence
means a broken connection, because obstruction produces quiet and never silence.
What it costs
Nothing, and there is no reason it should. Generating a tone is a few lines of code that every browser
already supports — no server work, no licensing, no processing cost.
The method in six points
Case off. Blot the exterior dry. Bluetooth off entirely. Volume 70–80 percent, not maximum. Grille facing
straight down at about 45 degrees. 30–60 second cycles with a wipe between each.
The rule for afterwards
Do not charge a wet device for 24 to 48 hours, however good the speaker sounds. A clear speaker tells you the
cavity is clear — not that the charging port is dry.