From Dahua Wiki
How to Setup Light Wiper
The Light Wiper feature allows a PTZ equipped with a Wiper to remotely clear moisture from the lens.
- Dahua Network PTZ with light wiper
- IP Address of Network PTZ
- Internet Explorer
Step by Step Instructions
1. Login to your IP Camera via Internet Explorer.
2. Under, "PTZ Settings" click the drop down box and select, "Light Wiper"