1. moisten the magic eraser and surface with water
2. rub off the deposit with light pressure
3. rinse with water after use and leave to dry
You should test the magic eraser on a small, inconspicuous area before each use to see if scratches occur. You should avoid sensitive, polished or painted surfaces.
Caution: It is completely normal for your magic eraser to emit fine powder. The magic eraser is an abrasive product. This means that it shows its effect by grinding off deposits from surfaces - this is actually a desired effect. You can simply wipe off the resulting powder with a wet cloth.