ETC Source Four Mini LED User Manual page 16

Cleaning
WARNING:
harsh commercial cleaners. Clean lens only as directed.
Commercially available glass cleaning agents should be
avoided as they may contain ammonia, other harsh chemical
detergents, or abrasive agents. These cleaners may damage
the lens surface. Do not immerse or soak the lens in any
cleaning solution.
1. Remove the beam focus knob from the shutter barrel.
2. Remove the lens tube from the shutter barrel.
3. Remove dust with a blast of oil-free air or wipe with a clean, lint-free
cloth.
4. Slide the lens tube back into the shutter barrel with the color frame
retainer clip on the top.
5. Reinstall the beam focus knob.
12
Do not use ammonia-based cleaners or other
Source Four Mini LED User Manual