I certainly seem to have started a debate on the virtues of 'lens care' in the form of lens caps, filters and lens hoods BUT what I was more interested in how to remove smudges on a second hand lens that already has marks on it.

I remember buying a second hand Rollieflex e3 tlr with f2.8 Xenor taking lens from a local photographic store. When I first looked at it both the viewing and the taking lens looked grubby. When I mentioned this to the man behind the counter he said "No problem sir I'll get our repairer to clean them" When I returned a few days later to buy it, both lenses looked like new...I have wondered to this day what the repairer used????

Thanks for all your suggestions. Cheers Dave
ps....All spelling mistakes are deliberate !!!!!!!!!