[accuab]

Insert a large flat head screwdriver in between the clear and black part and twist slightly around the whole lens until the seal gives. It is made so that the clear front has a lip that slides inside a groove on the black piece. I recently took mine apart to fix the seal and to sand down cloudiness. I don't think you should have cloudiness inside the lens except for moisture. And as for removing the vent, that's asking for trouble. I prefer to do it the right way as to just a temporary fix.