FUJITSU SCANPARTNER 600C - Manual (Page 26)

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3.7 Cleaning
3.7.1 Cleaning the document cover and the document glass
Use a clean and soft cloth moistened with non-corrosive solvent such as alcohol (with purity above 99.5%)
and wipe the document cover and flatbed document glass slightly, as shown in Figure 3.9.
Figure 3-9