Since these are built to be disposable e-waste rather than be repaired (repairability score of Zero of Ten possible) disassembly cleaning and drying which MIGHT work isn't really feasible. If however you want to try a VERY long shot, look at the (failed) teardown by following the link in the Airpods Pro - top of page - and see if there might be a way to get contact cleaner or alcohol inside swish it about and pray to your favorite Diety let dry half of forever and see if your Diety performed a miracle for you... which is what it will be if it works. a sealed container with silica gel will cut drying time to less than half of forever but will still be miraculous if it works.
Good Luck.
Consider active support of right to repair so maybe this environmentally and financially unfriendly practice maybe gets changed!