Thanks all - I have tried a bit of a clean at work just now using my glasses cloth, but I need to spray some of the cleaner on the cloth when I get home as the cloth alone isn't man enough for a couple of annoying little 'spit marks' - tiny drops where I can only think I might have coughed or something. Though I always cover my mouth .... one or two of them look like they might be coffee - probably when I try to sit down on the rush hour train with a laptop backpack and a coffee and read at the same time .......
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