If you find the CiBest projector is affected by dust, you can try to clean the projector according to the following steps.
1. Prepare the cleaning tools.
2. Put the projector upside down.
3. Tear off the base label.
4. Remove the bottom cover.
5. Take out a cleaning swab (cotton swabs can be dipped in alcohol).
6. Use cotton swabs to clean both sides of the screen.
7. Close the bottom cover after cleaning.
8. Affix the bottom label.
Then the cleaning of the CiBest projector is finished.