Never use sprays like window cleaners on electronics like your TV, cell phones, or LCD screens. They can do damage, as can the wood fibers from paper towels and tissues. Use a microfiber cloth instead or—in the absence of that—a coffee filter. If you need the extra umpf of a cleaner, use a 50/50 solution of white vinegar diluted in distilled water. And always spray onto your cloth, not onto the screen.