1. Assemblies of screen wipers with brushes have to look round regularly. If survey revealed existence of hardenings or cracks on rubber of brushes, replace brushes. If at survey nothing unusual is revealed, wet a windshield, include screen wipers, let's them work a little, and switch off them. Or strips on pure glass indicate an uneven trace from brushes on glass that brushes should be replaced.
2. If brushes insufficiently well clear a windshield, then the following reasons of it are possible.
When passing by the car of an automatic sink on a windshield wax particles got. These particles can be removed at addition in liquid of windscreen washer of the detergent having property to dissolve wax.
Filling of the tank of liquid for purification of glasses with voskorastvoryayushchy properties can significantly improve action of screen wipers. Fat-dissolving cleaners are not able to purify glass completely.
3. Damage of brushes can be also the cause of bad purification of glasses, brushes should be replaced.
4. During operation of the mechanism of screen wipers there can be a weakening of fixing nuts therefore they should be checked and as necessary to tighten every time when checking brushes (apply to Heads the Body and Onboard electric equipment for more detailed information on operation of the mechanism of screen wipers).