To the best of my knowledge, there is no dip that will kill eggs. You are correct in holding the frags in QT and inspecting for eggs or future "bugs" that may hatch, and then dipping a second or possibly third time.
As stated, I believe the gentlest and most effective dip (and least expensive) is Bayer. I use 1 ml per 100 mls of tank water for 15 minutes, and then rinse two times in tank water baths before reintroducing them. I also remove the frag from any plugs (unless they are plastic) because of the porosity of the plug absorbing dip material and then leaching it back into your tank. This procedure would be true with any dip you'd use.
As stated, I believe the gentlest and most effective dip (and least expensive) is Bayer. I use 1 ml per 100 mls of tank water for 15 minutes, and then rinse two times in tank water baths before reintroducing them. I also remove the frag from any plugs (unless they are plastic) because of the porosity of the plug absorbing dip material and then leaching it back into your tank. This procedure would be true with any dip you'd use.