I recently tried an experiment where I melted down all my small bar soaps (I use them till they get too tiny to hold) with some water. Voila, I had liquid handwash. Another reason to stop buying plastic packaged liquid soap.
Here's how I did it:
1. Collect all the soap scraps.
2. Place them on a pot on the gas with some water.
3. Keep mixing till it all comes together in one even consistency. Add water if you think it is becoming too thick.
Tip: If you think that there are still small soap pieces left that aren't melting, squish them with a spoon.
The end result!