I'm glad that is much better now.
Yes, there is a cleaning solution used by the field engineers. I'm not sure if you can buy it from Xerox, but is free for customers with contract to clean the top glass.
Once again sorry the confution about my posts.
Please consider to "Accept as a solution"
Yes, most of the glass cleaners will do. The important is using one that doesn't leave any stain or be corrosive.