Go ahead - just use the goggle wipe on it when it's dry and be gentle. The only time you can't wipe/touch the inside is when it's wet. If it's dry it's fine - and needs to be done otherwise as you know, you'll have smudges and spots from where water dried.
Shit, the way some of you are talking I could be mistaken that I'm going to loose my fucking finger by putting it near the inside of my goggles.
if it got in there it can get out. just give it time to dry - at least overnight, if there is still moisture inside hit it with a hairdryer or put it sitting a foot or two above a heater and let it dry out.
use common sense and don't do anything to melt the lens. if its really cracked and that's how it got in they're just fucked go buy new ones. if there is a big opening in the seam between the two lenses they're fucked go buy new ones. whenever you do end up with new lenses never ever ever ever touch the inside of your lenses. wicking droplets up with the corner of a napkin is as close as you can get.