To fix this: Use a small spray bottle, baby shampoo, and water. Fill the spray bottle of the way full with shampoo, and then add water. Spray on fronts and insides of goggles, and rub. This recipe is from a coach and it works AMAZINGLY!
I love my kids, but like I've told them, "I am not your friend, I am your parent. You HAVE friends. Too many kids have parents who want to be their friend, when what they really need is for their parents to act like PARENTS." My kids soo agree.