Hello adri113,
Please check out the information in the following link, which explains what to do if you receive a liquid-detection alert on your iPhone, and may help: If you see a liquid-detection alert on your iPhone
If your iPhone or Lightning accessory is wet
Unplug all cables or accessories. Don't plug them in again until they're completely dry.
To dry your iPhone:
1. 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.
2. After at least 30 minutes, try charging with a Lightning cable or connecting a Lightning accessory.
3. If you see the alert again, there is still liquid in the Lightning port or under the pins of your Lightning cable. Leave your iPhone in a dry area with some airflow for up to a day. You can try again to charge or connect a Lightning accessory throughout this period. It might take up to 24 hours to fully dry.
Here are a few things not to do:
* Don’t dry your iPhone using an external heat source or compressed air.
* Don't insert a foreign object, such as a cotton swab or a paper towel, into the Lightning connector.
* Don’t put your iPhone in a bag of rice. Doing so could allow small particles of rice to damage your iPhone.
For additional assistance, please contact Apple Support. You may be able to reach them here: Contact Apple Support
Thanks!