Oce CS120 Reference Manual page 170

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1
The touch panel display needs to be cleaned. Wipe the touch panel display with a
piece of well-wrung cloth dampened with water or a mild cleansing agent, then wipe
it again with a dry cloth.
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NOTE
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The touch panel display becomes dirty with use. It is recommended that you clean the
touch panel display once every week or ten days.
Cleaning the Copier