As much as Lily wasn't in the mood to do what he asked, it wasn't completely out of line for a saltine-and-salt-lick relationship. Like every other enlisted unicorn kept on a tight leash by their drill instructor, she knew a couple of basic spells to get stains and smells out of clothes. Even if she had to send it out to be cleaned, there wasn't any real risk of her showing up to the Gala with a dirty dress. 