I'm in Azerbaijan so just waiting for the shot to hit the fan...
It occurred to me, is there a sensible way to clean paper money. Unlike the UK we don't have plastic money and all the ideas of putting paper money in the washing machine seem a bit impractical since you use it every day.
But I'm wondering if putting it in a sealed bag in the freezer would also do the job? It works for smelly shoes, but that's a bacteria problem I think.