How often should you clean your lens depends on a variety of factors, such as how often you intend to use your lens, how dirty it is, and what type of environment you will be using it in. However, most experts recommend cleaning your lens regularly, at least once every two weeks, to keep it in good working condition and to prevent any potential damage.
Projector lamps need cleaning every few months. Cleaning the lamp helps prevent dust buildup inside the projector, which could cause light loss and damage to the lamp. Clean your lens if you notice any smudges or fingerprints on the surface. To clean the lamp, simply remove the lamp cover, wipe down the glass surface with a soft cloth, or by using lens cleaning fluid or a lens tissue, then replace the cover.