Volkswagen Golf GTI 2016, Owner'S Manual, Page: 454 / 1341

Windshield washer fluid without enough frost protection can
freeze on the windshield and reduce visibility.
Use the windshield washer system with enough frost
protection for winter temperatures.
Never use the windshield wipers/washers when it is freezing
without first defrosting the windshield. The washer solution
may freeze on the windshield and reduce visibility.
WARNING
Worn or dirty wiper blades reduce visibility and increase the risk
of accidents and severe injuries.
Always replace wiper blades that are worn, damaged, or do
not keep the windshield clear.
WARNING