Not sure on the turret, however if built like my other turrets, 3 screws would hold front back together. How normally different the camera is normally connected to front part of the half, inspect wires if some are same mark wire side and connector side one edge of same so you put the correct wire back to correct connector.. remove wires and then un screw camera from front, then remove screws that hold plate for IR to front. That should then gain access to ring. Clean inner glass and install back. Not sure it's built the same as bullet. If it is make sure glass and black cover are clean, lay black ring back to glass making sure it's on pins and sitting flush. Put ir back in and install screws. In the back are some gel packs, if you had replacements I would replace them they are taped to back then Install things back together.
Personally don't know your turret, the ones I have large and small didn't have same setup. Like black ring is built better and in my case are screwed down not just press fitted. I do remove and clean while I do my maintenance routine but I am not the normal end user, and live in area with humid weather.
As someone stated issue is rare and would make sure to exhaust all other light reflection things from your installed area.
Personally don't know your turret, the ones I have large and small didn't have same setup. Like black ring is built better and in my case are screwed down not just press fitted. I do remove and clean while I do my maintenance routine but I am not the normal end user, and live in area with humid weather.
As someone stated issue is rare and would make sure to exhaust all other light reflection things from your installed area.