I bought myself some dressy secondhand earrings from a local auction house 6 months ago and haven't yet worn them. I have a big dinner tomorrow night and could finally wear them. I have just noticed that while they are very sparkly (these are emerald studs) they have a little bit of someone else's ear gunk on the posts <boak>. I can get that off but need to disinfect them. Can I just give them a good dunk in surgical spirit?