One can never wash their hands enough and another innovation to help people in remote areas who do not have access to tap water is the Tippy Tap.
All you need is a little engineering skill, some stick, strings and a few containers. The setup is simple, a can of water is made to hang on a branch and attached with some string to a stick placed not too far from it on the ground.
To access the water, one must step on the stick to tip the can that will allow the free flow of water without the user touching the container. Usually, soap is tied to a nearby branch for easy access.