This is a Topcor 58 1.8, from a Topcon which I recently pulled form a cupboard after about 15-20 years. I've taken a few shots with it (about 8 from a roll of film, before I changed cameras), which seemed OK - although I haven't looked that closely. But I've noticed that the lens has some white cloudy areas inside it (I've indicated what I mean in the image), which I thought at first were just reflections. I'm not worried about the dust (of which there is lots), but I'm wondering what these areas are and if I should/can do something about it? This is never going to be my main camera or lens, so it's not a huge issue. But it would be nice to get the most benefit from it, if possible. Thanks.