If you've noticed that your projector screen is sticky, it's likely because of a build-up of dust and dirt. Over time, dust can accumulate on the surface of the screen, making it sticky to the touch. In addition, if there are any liquids spilled on the screen, they can also cause a sticky residue.
To clean your projector screen and remove any stickiness, start by using a soft cloth to dust off the surface. If there are any stubborn spots of dirt or grime, you can use a mild soap and water solution to gently wipe them away. Be sure to dry the screen completely afterwards so that no water streaks are left behind.
If your projector screen is still sticky after dusting and cleaning, it's possible that there is a more serious issue such as mold or mildew growth. In this case, you'll need to contact a professional for help in getting rid of the problem.