My four year old is about to enter pre school. I can't trust her to consistently follow good sanitary practice! A few months ago she thought it was funny to li

My four year old is about to enter pre school. I can't trust her to consistently follow good sanitary practice! A few months ago she thought it was funny to lick her hands clean, like a cat, after going to the bathroom. She sometimes walks up to me with a booger on her finger and doesn't even think to wash her hands. I don't know how the pre-school we arranged for her (in Massachusetts) will handle this.