Although it may look dirty, cleaning by yourself is not recommended. If it's so dirty that it impacts the picture, take it to a qualified service center and have it professionally done.
Read All Reviews for Discovery Expedition Wonderwall Entertainment Projector at Overstock.
If you are looking to buy a new projector for a classroom, meeting room or home theater, the image you project on the screen should make a great impression on your audience. Researching projectors can be confusing, to help you with many acronyms and technological terms, see Epson's How to Buy a New Projector - Projector Guide.
Learn these Five (Extremely) Useful Tips on Caring for Your Projector shared by _ Projector SuperStore_.