Very Faint earpiece volume - fix, inaurance claim or repair shop?

Hi all,

My young lad - spilt coke on my phone - result is I can barely hear through earpiece.

Wondering if anybody else has had this problem? Any ideas for fixing?
Done the restore/hair dryer/rice bag - no change.

Since the excess on the insurance is €65 (and going without for a while) - wondering if it might be better bringing to a repair shop.

Thanks in advance!