WaterAid conducted rapid research studies in Bangladesh, India, Nepal and Pakistan in May & June to assess the effectiveness of handwashing promotion, with a particular focus on marginalised and vulnerable groups. 

The research reports and a regional synthesis of key findings and recommendations can be downloaded here: 

https://washmatters.wateraid.org/publications/an-assessment-of-handwashing-promotion-in-south-asia-during-covid-19