You CANNOT kill primers with chemicals!!
Matt 304--This has been discussed ad nauseum on this and other fora. There is no reasonably safe household chemical that will reliably kill primers 100%. Not WD-40. Not bleach. Not lubricating oil. Not boiling water. Not snake oil nor witch juice. People have experimented with many, many ways to kill primers. Nothing that's been reported kills 'em 100% except: Percussion (hit 'em with a hammer) or heat (toss 'em into a fire).
I assume that fuming nitric acid would do the trick but most people don't have that to hand at home. And it's nasty to work with.
I'm sure it's covered under Murphy's Law: If you get one smidgen of oil on a round you actually want to fire normally, the primer may get killed, and you certainly can't depend on that round going bang when you pull the trigger. But if you WANT to kill a bunch of primers, when you soak 'em in oil, only some of 'em are killed.
Or, statistically: The liklihood of any given outcome actually occurring is in inverse proportion to the desirability of that outcome.
As has been pointed out above, they're not that hard to deprime if it needs to be done. No need to try spraying them first.