How do I take dried contained by shampoo out of a 100% silk shirt, is it even possible?
Answers: Take it to a dry cleaners. If it's washable, just swab it. It should come out. Water dissolves the shampoo.
If the shampoo doens't have extras..it's merely shampoo..then soaking the shirt should release the 'poo. However if near are conditioners, brighteners, etc, they may in in attendance permanently. Of course a wash silk shirt will need ironing..discreetly. If that's not for you, take the shirt to the drycleaners and see what they can do.