liquid detected in charger now won’t charge

Visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.

And they could offer a possible solution.

(perhaps) You will first have to make an appointment due to the pandemic.

See: Contact Apple for support and service

Contact Apple for support and service - Apple Support

If your iPhone or Lightning accessory is wet

Tap your iPhone gently against your hand with the Lightning connector facing down to remove excess liquid. Leave your iPhone in a dry area with some airflow. After at least 30 minutes, try charging with a Lightning cable or connecting a Lightning accessory.

If you see a liquid-detection alert on your iPhone - Apple Support