Need advice on collection of world notes

Hi there, I’ve been digging through a bag full of old money my late uncle left me from his travels through the world. It’s mostly from the 90s or prior, I think the oldest pieces are some wartime francs, but everything is pretty folded up and gritty feeing, and of course none of it is in any kind of display or container. I’m probably going to sell a good deal of it, so I was wondering if I should do any kind of cleaning of any of this stuff. Some of it is pretty fragile.