Does Fix My Speaker actually work if water gets into the phone speaker?

[sonya19]

Recently, my phone got a bit wet. Since then, the speaker sounds lower and a bit muffled.

I came across a web tool called Fix My Speaker that claims to use high-frequency sound to push water out of the speaker.

Has anyone here actually tried it and seen results?
Does it really work?
Could it cause any harm to the phone?

Would really appreciate hearing your experience or opinion?