I am currently cleaning a Super 23 I got for a bargain price. The viewfinder is very hazy and dirty. Which mirror should not be cleaned ? I found a site which describes how to clean the veiwfinder assembly . It tells how to do everything , but it states nowhere of which mirror has the rangefinder spot . Yes, I am a novice at this. I have read where a novice such as I has wiped off the rangefinder spot by cleaning, and I wish to avoid that mistake. After learning on this Super 23 I will try to clean my good 23.