Do you know how it's been stored for all those years?
When you say that the rounds could use a good wipe down, why? Is the brass just dull looking or is there some corrosion on them?
If there's any green goo coming from the case, those are bad for sure. Any corrosion that has eaten into the case is better to toss then risk a KB in your firearm.
Can you post a picture of them?