Along the Milky Way

Exploration Stage: Beauty Salon
From: Roger Doubledeal
Description: My guess is the salon has a client with rare taste whom they’re trying to please. They even ordered donkey milk to put in the client’s coffee. The carton should be around here somewhere. Look for it.
Completed: It’s donkey milk, all right, in the zoo’s signature packaging. It’s not enough for a bath, like Cleopatra famously took, so I think it was used in some other way. But how, exactly?