Wiper Blades
Chapter 8 · Manual page 332
Grease, silicon and petroleum products impair the blade’s wiping capability. Clean the wiper blades in warm soap water, and check their status periodically.
Clean the windscreen frequently. DO NOT use wipers to remove the sediment on the windscreen, it will reduce their effect and their life span. If signs of hardness or cracking in the rubber are found, or if the wipers leave streaks or unwiped areas on the windscreen, then the wiper blades should be replaced. Clean the windscreen regularly with an approved glass cleaner and ensure the windscreen is thoroughly cleaned before fitting replacement wiper blades. Only fit replacement wiper blades that are identical to the original specification. If the wipers or windscreens are covered with ice or frozen, clean ice and snow from the wipers and windscreens before attempting to operate them to avoid possible damage.