21fbp22 front lens cleaning

[timmy]

hey guys anyone familiar with the 21fbp22 lens, is this lens held on with a rubber band type of thing that goes all the way around the edge of the tube and is there any pva or oil type material between the surfaces or does it just have an air gap between the tube and lens? it has a slight cloudy area in some spots, i figured i could separate the two and use windex to clean it up. looking at the front close it looks as if it has a gap between the two. befor taking it out should i make marks to put it back in its exact place the way it came out being it is a round tube.