SonicKit - Speaker Water Eject
No sign-up, and it works without an internet connection. Free on Android.
How to get water out of a phone speaker, telling water from dust from real damage, why rice is a bad idea, cleaning the speaker grille, hearing age by frequency, checking a parent’s hearing, safe earphone volume, summer pool and beach care, and white vs pink vs brown noise. Practical guides, each solved with the SonicKit app.
No sign-up, and it works without an internet connection. Free on Android.