[geekmaster]

It sounds like you are trying to get rid of a full-flash update, which draws a negative version of the page before a positive (simplified description), helping to clean the page (and also helping draw at a higher contrast). If you do not do a full-flash update once in awhile, the screen starts to look dirty and smudged (with old ghosted images), much like a chalkboard that needs washing. I believe there is a way to turn of full-flash. It was discussed here long ago. I will try to post here if I find it.