So I had some bad smudges all over the focusing screen of my Pentax LX. My teacher suggested I clean it with a little alcohol and a q tip. I got the smudges off perfectly but now the screen is completely covered with streaks! I've tried water, more alcohol, and a citrus cleaner, all to no avail. I've tried soaking the screen and still nothing. As soon as it dries different streaks appear. I can barely see through the viewfinder. Is it possible to make it clear again or should I just get another screen?