I have not used my film scanner for some time and when I have tried been very aware that the quality was poor. This morning I had another go and it was terrible. The scanned image looked like it was flared and I suspected the lens or glass inside the scanner was filthy. A quick Google to see where I could get it serviced produced two web sites on “do it yourself” scanner servicing. 12 screws later and I had it in bits on my desk and a very tiny mirror the size of my thumbnail in my hand. There was so much dust on the mirror that I could have written my name in it. A bit of soft lens cloth and alcohol solution and it was spotless.
Proud of myself I reassembled it and all is perfect now. No lens flare and back to as good as new.