Ive just taken the polarising film off, was abit hard to take off. I made a mistake of heating it up with misses hair dryer. By heating it up you will leave some glue on the lcd. I have cleaned both lcds up with white spirit. I remeber when i was young i used to take my calculator apart and flip the film over. I might go poind shop and buy a big cheap a$$ calculator and see if that works. By flipping the film around the lcd goes dark and number are colourless.