The WHO has published a factsheet on hand hygiene: why, how & when? It can be accessed here: https://www.thecompassforsbc.org/sbcc-tools/hand-hygiene-why-how-when-0
The US CDC has published a range of posters about hand washing. They can be accessed here:
A set of five documents with key messaging for supporting WASH in HCF advocacy. The pack includes key messages and talking points, including for WASH & COVID-19.
This fact sheet can be used by social and behavior change communicators (SBC developers) when designing hygiene materials. It describes a) How to hand rub, b) How to handwash, c) 5 Moments for Hand Hygiene