The Service Manual received was helpful. Good copy of original document.. I recomend all of my friends about this technical page.
Text excerpt from page 32 (click to view)
10 Maintenace
10.1. Cleaning Lens and LCD Panel
Do not touch the surface of lens and LCD Panel with your hand. When cleaning the lens, use air-Blower to blow off the dust. When cleaning the LCD Panel, dampen the lens cleaning paper with lens cleaner, and the gently wipe the their surface. Note: The Lens Cleaning KIT ; VFK1900BK (Only supplied as 10 set/Box) is available as Service Aid.