Dont do it Mike, I did it once and it was a bloody disaster, bits all over the place had to throw it in the bin. Can you see any degradation to your prints because of it? I had a fly in my lens and it effected the quality of my prints but I often shoot with dirty lenses without any noticeable effect. and the joke LMAO, bet I can't remember it next time i'm in the pub:O)

Those who do not want to imitate anything, produce nothing. Salvador Dali