Sound like they don't need clean (After all, that's an imbuing thing and they don't Imbue) - just a slayer.
If the other properties don't matter, it's a matter of runic Roulette. I wouldn't waste anything higher than bronze runics trying to runic craft super slayers, as that's the best runic you can get from a small BOD. Gold and higher runics require WAY too much ingot investment to waste on trying to craft random superslayers.