Liquid debris message after rainstorm

Caught in a rainstorm phone was in pocket. Phone worked fine, but at end of day when I plugged in the charger, I got the liquid debris message. Put phone in a ziploc with silica gel packets for a few days... blew out port. Still nothing, still get liquid/debris message. Enabled USB. Still not charging. Contacted Google. Leaving phone plugged in, I guess it trickled enough juice to be able to clear cache, and storage from settings app. Still wouldn't charge... bought a sync cable (USB A to USB C), plugged in to PC to backup device stored photos, etc.... Phone starts Charging. Almost a full charge from PC. Take it off sync cable, plug into charger. Get liquid debris message again, no charge.... Plug back in to Sync cable, phone starts charging. Charger still works on wife's 4a. Utterly confused!9