The lens of the BenQ V7050i projector may be polluted by dust or smears. You can clean the lens regularly to keep it clean and achieve good performance.
Clean the lens whenever you notice dirt or dust on the surface. Please turn off the BenQ V7050i projector and let it cool down completely before cleaning the lens.
Use a canister of compressed air to remove dust.
If there is dirt or smears, use lens-cleaning paper or moisten a soft cloth with lens cleaner and gently wipe the lens surface.
Never use any type of abrasive pad, alkaline/acid cleaner, scouring powder, or volatile solvents, such as alcohol, benzene, thinner, or insecticide. Using such materials or maintaining prolonged contact with rubber or vinyl materials may result in damage to the projector surface and cabinet material.
It is worthy to note that do not cover the BenQ V7050i projector with cloth pad to avoid overheating.