Surprise Soap is a soap bar that has a toy embedded in the middle of the soap bar to encourage children to wash their hands. Surprise Soap was made specifically for a pilot hygiene study in Iraq. As of 2020, the researchers are currently setting up two larger trials to test the soaps in Sudan and Somalia and exploring different manufacturing options and pre-existing suppliers.
Distributors / Implementing Organizations
London School of Hygiene & Tropical Medicine
Toys are 3D printed then embedded inside melted local shop-bought soap that is then poured into molds.
Intellectural Property Type
User Provision Model
As of 2020, the soap is distributed by the researchers.
Distributions to Date Status
Number of uses
Power supply type
Toys are co-designed by children and then these toys are embedded inside soap.
Varies depending on the size of the bar of soap.
Manufacturer Specified Performance Parameters
Increase children's handwashing consistency.
Vetted Performance Status
There are no known safety issues with this product.
Complementary Technical Systems
Academic Research and References
Watson, J., Dreibelbis, R., Aunger, R., Deola, C., King, K., Long, S., Chase, R.P., Cumming., O., 2018, Child’s play: Harnessing play and curiosity motives to improve child handwashing in a humanitarian setting. International Journal of Hygiene and Environmental Health.
Compliance with regulations