Samsung SF 4700 - Manual (Page 140)

6.15 Maintenance
3. Wipe the roller surface with a soft cloth dampened with water.
4. Clean the ADF rubber piece.
5. Carefully wipe the scanning glass with a soft, dry cloth.
If the glass is very dirty, first wipe it with a slightly dampened cloth,
then with a dry cloth. Be very careful not to scratch the glass surface.
6. Replace the roller in reverse order, and then close the front panel
firmly until it clicks into place.