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Wipe the insides with a cloth soaked in methylated spirits or other denatured/rubbing alcohol. Don't confuse these with petroleum-derived solvents, which are much more likely to damage the shoes.
Answer
Wipe the insides with a cloth soaked in methylated spirits or other denatured/rubbing alcohol. Don't confuse these with petroleum-derived solvents, which are much more likely to damage the shoes.