Dips don't kill the eggs. Every piece should be very closely inspected for eggs, and the eggs need to be scraped off.
Egg masses are easy to see and are laid around the dead base area. I always get fresh cut frags or cut the frags off of any base to avoid things that hide down there. I also check (almost) every frag under a microscope for pests.
It's the "almost" factor above that will kill you -lol