heyyyy,
You don’t need to open it or anything
I dropped my phone today in cooking oil and the speakers had a terrible voice. So what I did is I tried to remove oil using vinegar and perfume but instead it made the iPhone have no sound. So there was a piece of rice stuck from my attempt to sock it in rice so I kept on hitting the phone with my hand to get it out and magically the speakers became way way better than before and the microphone was working!