Is there any Caustic Soda in a bar of soap

Soap is made using caustic soda, a liquid (usually water or milk) and oils or fats.  When these ingredients are mixed together a chemical reaction called "Saponification" starts.  Within 17 hours this reaction has formed two brand new products: Soap & Glycerine.  There is no caustic soda left in the soap, providing enough oils or fats are in the formula to use up all the caustic soda.