Don't use rubbing alcohol.
I use glass cleaner, clean in small areas. Use a light to find out which areas you've missed. If you've never cleaned it before take your time it'll take awhile. Use a paper towel, napkin, don't use something that gives off lint otherwise you'll have a clean screen with white specs all over. Spray the towel, not the screen. Some cleaning fluids will cause white spotting on cheap plastics. Use a wet q-tip to get into the corners.