I think it's probably best to just get rid of them, fish are skittish little fellas. if they detect an unusual scent they may be too wary to take the lure.
I find that if i have a soft plastic kicking around the tackle box for too long it's collects all sorts of contaminants ie. wd40, oils and perhaps mould as in you case, and they are generally ineffective.
Shame, because these gulps aren't cheap.