How do I get rid of cocoa and chocolate stains?

To remove fresh stains do not use soap, because that can cause the stains to become affixed. Drape the stained cloth over a bowl and pour boiling water over it. Then rub liquid detergent into the cloth.
Thoroughly rinse with warm water.

To remove dried chocolate stains, treat immediately with glycerine, then wash with warm water and methylated spirits.
Another way is to knead the stain with a powerful solution of borax in water, and then treat with boiling water.