Samsung SF-5800 User's Manual Setup And Operation page 88

3.12
Maintenance
4. Clean the ADF rubber piece also.
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 control panel
firmly until it clicks into place.