I did have a go at this yesterday Asa, but my effort was rubbish, so I got rid of it.
Are all those marks water stains? I have had good results going over old photos with a damp cotton bud which has somet]imes got off loads of dirt, but presumably wouldn't help here......
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 Merry
"Something has been filled in that I didn't know was blank" Matthew Broderick WDYTYA? March 2010
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