[blucar]

Neats-foot oil is an old time leather dressing used to soften, waterproof leather.
Disconnect the hose from the wiper motor, put a few drops of neats-foot oil into the motor, cycle it back and forth a few times to spread the oil around within the housing.
In the States neats-foot oil would be found in a farm/home store, the same is probably true in Russia..
ATF might be alright, however, ATF is designed for rubber/neoprene seals, might not be good for leather. WD-40 would be the worst thing to put into a wiper motor.