Not exactly cooking but it did happen while cooking.

Does anyone know the best way to remove a chocolate stain? I didn't realize I got chocolate buttercream on my shirt until after I had washed it. I DID NOT dry the shirt, so hopefully I can get the last bit of the stain out. It's a faint stain. I put it to soak in water and Tide.
I seemed to remember someone here is a chef or a cook or works in food or something.
Thanks so much for your suggestions.
Ginger