A free app for Android, by LuxDeLux.

Speaker Cleaner – Remove Water Fix & Boost Sound is a free utility for Android devices. It can help you remove water and other unwanted things from your speakers. If your device has a sound problem or if the sound is muffled, then this app can fix the problem in a simple and easy way. It can also help you boost the sound of your speakers.

It is free to use. It has a simple interface and few options to choose from. It has a cleaning mode and an auto-cleaning mode.