This question has probably been asked a thousand times but here goes.

I just bought a Plustek 7500ISE scanner to scan my dad's old slides. As I
peeked at a few, they look fairly dirty. How do I clean those up? Obviously
not with water (the cardboard holder wouldn't last long and water might
damage the slide itself).

So what is the best way to clean those? Any particular product/method?

Thanks a lot!

Marc