I use povidone iodine which is similar to Lugols. I also use Melafix marine. I'll do an iodine dip in a container, then soak / rinse the frag for five or ten minutes in another container, then dip in Melafix, then another soak / rinse, then back in the tank.
Others decent dips include Tropic Pro Marine Coral Cure, Revive and hydrogen peroxide.