If they have sprouted you may be able to save them. Open the container and put a light very near it. This will help to dry things out some. After it dries out try to get some of the soil out that had the white fuzzy stuff on it and replace with fresh soil.
Make sure you don't over water and if possible water from the bottom. If the crud keeps coming back start over but make sure you sterilize your containers with some bleach solution. Good Luck!
I am assuming you have a cover over them- plastic, etc. You need to get air circulating around them. Take the cover off and see if it helps. If you don't have them covered, they must have been very wet. Good luck!!