Buy gauze and use warm water it will take off all the milk.gauze is the netty like cotton used before placing plasters on wounds .it is a lot better and hygienic because as you use you dispose. It is cheap and the quantity in it is much

Use a clean, damp washcloth, or a finger brush to gently wipe clean the first teeth and the front of the tongue, after meals and at bedtime. Toothbrushes moistened with water and no more than a rice-grain size smear of fluoride toothpaste but preferably low or no fluoride toothpaste.

Use tomato liquid with cotton wool to clean it or get glycerin