The problem we face when washing our hands with soap is that there is always soap residue left on the side of the sink. The idea we had over here was to take inspiration from the traditional wash board and create something that would allow you to grate the bar of soap and then use the soap flakes to wash your hands. Therefore the bar of soap would have no contact with water to create the soap residue.
The two images above and below are a demonstration of the soap being grated and then what you are left with.
The following 4 images are of a model I made to show what the product could possibly look like. The product could be made from materials such as wood, ceramic or slate.