BT Fax User Manual page 58

Gently wipe the case with a soft, clean cloth
dampened with a mild detergent. Do not use abrasive
cleaning agents.
If a streaky or dirty pattern appears on a copy or fax
you have sent, clean the two document feeder
rollers with a soft, clean cloth dampened with a mild
detergent.
Open the control panel.
Press the document sensor to rotate the feeder rollers.
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Clean the document feeder rollers, then use a dry
cloth to dry them thoroughly.
Close the control panel.