Correct answer
When deteriorated or unable to wipe properly after appropriate checks.
Replace blades when deteriorated, for example with hard, cracked or torn rubber, or when they have lost wiping performance. Also check glass and blade cleanliness and the mechanism: irregular wiping may result from dirt or adjustment, not only worn rubber. Replace a deteriorated blade if cleaning or inspection does not resolve the problem. Follow manufacturer recommendations and do not wait for the holder to break. No single six-month interval suits every use.
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When deteriorated or unable to wipe properly after appropriate checks.
Only when the holder breaks, even if visibility is already impaired.
Always exactly every six months, disregarding condition and manufacturer guidance.
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