Vivotek PZ6114/PZ6124 - Manual (Page 67)

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B. Cleaning the Lens
The Network Camera with Pan/Tilt/Zoom is a network camera with high quality lens.
When it is necessary to clean the lens, please follow these instructions:
1. Prepare cotton swabs and alcohol.
2. Moisten the cotton swab with alcohol.
3. Slightly clean the lens.
4. If the lens is still dirty, repeat 2~3 steps until it is cleaned. Change a clean cotton
swab if the old one is dirty or contains dirt that might scrape the lens. Never touch
the lens hard or roughly .