Crown molding or baseboard molding? Bathrooms and laundry rooms are notoriously humid areas. Make sure that you painted with the right paint (that discourages mildew) and that your dryer is venting to the outside. You can spray a diluted bleach spray on it to kill it and then paint over it with kilz if it doesn't wipe off. If it's in a basement, consider a dehumidifier.
02:23PM | 06/28/13
Thanks for the tip. It's on the baseboard and that is the only area I found. Hoping there isn't a leak since it's an outside wall. Will try the bleach formula for cleaning.