Working at a High School I occasionally have to team with our school nurse to talk to students about hygiene. Here are some of the materials I use.
Articles
PERSONAL CARE HEALTH SOCIAL SKILLS AND SAFETY (Manual) -Great Resource*
Hygiene in Adolescents with ASD
Assessment
https://www.therapistaid.com/worksheets/self-care-assessment.pdf
Tools
Videos
Scientific
Old School -Things haven’t really changed too much.
Cartoon
What is Puberty? Decoding Puberty in Girls
All About Boys Puberty
Inside Puberty: What Are the Stages of Puberty?
Building Momentum in Schools 
