From what I have read, a lot of people have had issues with bleach dips in general when treating mosses (although some are more tolerant than others). I would suggest doing an alum bath. You can get a small container of alum in the spice section for like $3-4.
I have been using alum baths for my plants / mosses to kill snails and snail eggs before transferring over to my newer setup. I use 2 - 3 tablespoons per gallon of water and soak the plants for 24 - 36 hours, give them a rinse under the sink, then soak in clean water for a day.
The snails die rather quickly and you can see the egg sacks dissolve.