Samsung SF-555P User Manual page 139

4. Clean the ADF rubber piece.
5. Carefully wipe the scanning glass with a soft, dry cloth.
6. Replace the roller in reverse order, and then close the front panel
Maintenance
6.6
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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.
firmly until it clicks into place.