Rapunzel, Rapunzel, Wash Your Hair!: A Story About Hair Hygiene (Fairytales Gone Wrong) by Steve Smallman (Author) and Neil Price (Illustrator) was released this past October.
This one reminds me of the following skit by Studio C:
In Rapunzel, Rapunzel, Wash Your Hair! three princes try to rescue Rapunzel from her tower. However, Rapunzel never washes her hair so it's greasy and filthy--too slippery to climb! Luckily one of the princes is a hairdresser and knows just how to save Rapunzel and her unruly hair. This series is a welcome addition for parents looking for picture books with a message.