1. I have recently found this amazing tool. I would not be without one now... The pad does not need washing as it cleans it's self. It is also great for cleaning drawing tools. shapers, brushes etc.
2. Fold as directed and rub to clean off any marks that you get around your drawing.
3. As you will see in the third image it leaves crumbs of rubber. Sweep them away with your brush.
4. It leaves a nice clean surface and no damage to the tooth on the surface.
I have researched the availability and most art stores carry them. Dick Blick has them. I paid $14.95 in Au ....They are much cheaper in the USA.