Correct answer
Inspect them and replace them if deteriorated or wiping poorly, following manufacturer guidance.
Inspect their condition and follow manufacturer maintenance guidance. Replace deteriorated blades, for example when rubber is hardened or cracked, or wear leaves unwiped areas. Do not wait for a support to break: if it is also damaged, it needs appropriate repair or replacement. There is no universal six-month interval for every vehicle regardless of condition and manufacturer. Good maintenance helps preserve visibility but does not alone guarantee perfect vision in every condition.
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Replace them only after their support breaks, even if they already wipe poorly.
Inspect them and replace them if deteriorated or wiping poorly, following manufacturer guidance.
Always apply a six-month interval to every bus, regardless of condition or manufacturer guidance.
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