I've sometimes used a scratch removal wax and left a film on inside because i didn't polish it properly or (maybe) used too thick and application, or whatever.

An application of Windex or clear vinegar with some clean water to dilute it would clean that off -- HOWEVER, use a soft, clean, smooth cotton rag. Careful with paper towels unless they are very soft.

If that doesn't work, then if it's cloudy on the inside, I have no idea what it could have been.