Richard I have no direct knowledge; however, I have found the people at HP's tech support to be very good. If there is a coating on the glass that could be damaged by acidic (vinegar) or alkaline (soap, windex, etc.) they will know. If you are going to call HP's tech support I would suggest avoiding Monday, Friday and late in the day. If HP has an email tech support this would be an idea question for that medium.
______________ Gordon Potter <[EMAIL PROTECTED]> Nashville, TN 37215 USA >
