I bought a wooden desk that is painted white. I used a plastic desk protector on the desktop for a couple months. When I took the deck protector off the desk, the paint on the desktop has a 'film' over it and it is 'sticky'. I can scrape the 'sticky film' off with my fingernail and leave a groove in the paint. Cleaners won't take the 'film' off. What is wrong with the paint and how can I restore the white desktop?