New Type Hydrophobic and Scratch resistant treatment ............ made with polysiloxanes ( http://www.eng.buffalo.edu/Courses/ce435/Polysiloxanes/

Works on an type of surface and any type ofmaterial, from an AR coating to a simple un coated CR39.
Just spray onsurface, making it nice and wet, then wipe and dry with a paper tissue. Willlast over 12 month, withstanding the abuse of never have been stored in aprotective case. It can be redone any time.

Check at: http://optochemicals.com/spray_andwipe.htm

Free sample for north American optical businesses, outside this continent you pay the transport.