HP 1175C - Manual (Page 76)

9-2 Maintaining Your HP OfficeJet Pro
To clean the glass:
1 Turn off the HP OfficeJet Pro, remove the power cord, and then
raise the document cover.
2 Clean the glass with a soft cloth or sponge slightly moistened with
warm water and a mild soap or detergent. You may also use glass
cleaner.
CAUTION Do not use abrasives, acetone, benzene, or carbon tetrachloride on the
glass; these can damage the glass. Do not place liquids directly on the
glass. They may seep under it and damage your HP OfficeJet Pro.
3 Rinse the soft cloth or sponge with clean water, wring out excess
water, and wipe the remaining soap or detergent off the glass.
4 Dry the glass with a chamois or cellulose sponge to prevent
spotting. If soap or detergent does not clean the glass sufficiently,
you can use isopropyl alcohol as a cleaning agent.