Correct answer
When the rubber is damaged.
Windscreen wiper blades should be changed whenever the rubber is damaged. Over time and with use, the rubber strips on the blades harden and crack, reducing their effectiveness at cleaning the windscreen properly. If the rubber is hardened or cracked, the blades will not fit the glass properly, leaving unwiped patches and causing annoying noises during operation. This can hinder visibility and safety when driving in rain, fog, snow or mud. It is important to check the condition of the wiper blades regularly and replace them as soon as signs of wear or damage appear on the rubber.
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Every two years, without exception.
Always before undergoing the vehicle's technical inspection (ITV).
When the rubber is damaged.
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