Normal silicone sprays and oils can be used for lubrication. We recommend first cleaning the profiles and parts and lubricating the system once or twice a year so that the glasses move smoothly. The spray should be sprayed sparingly. Do not use other lubricants or greases such as petroleum jelly or oils. They often attract dirt, which can damage the wheels of the system. If for some reason the glasses do not move smoothly, contact our service department