Correct answer
When hardened, cracked or deteriorated and no longer wiping properly.
Replace them when hardened, cracked or deteriorated and no longer wiping properly, and follow manufacturer inspection and maintenance instructions. Do not wait until they break or ignore deterioration because a calendar date has not arrived. Keeping the blades and glass clean helps, but does not repair cracked rubber or by itself guarantee perfect visibility.
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Only when they break completely.
Only once six months have passed, even if they deteriorate sooner.
When hardened, cracked or deteriorated and no longer wiping properly.
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