Dude, did you know there is an online tool called Fix My Speaker, it works like a charm! Suppose, your phone suddenly got wet or dust got in and the sound got stuck then you don't have to do anything, just go straight to that website and press the “Fix My Speaker” button. There you will hear a strange sound, which vibrates the speaker. The water or dirt inside is released by that vibration. Let it play for 30-60 seconds, and if necessary, run it again. You will see, your phone's speaker is making a sparkling sound like before! To useing this tool check this link
https://fixmyspeakerpro.com/