Most
of the time the answer is NOW because you are driving in a heavy rain storm
and realize that they aren’t doing their job.
The next day is sunny and the
wipers are forgotten about again until the next storm.
Wiper blades and
inserts are a maintenance item that should be checked and or changed
periodically. Most manufactures recommend at least once a year.
Wipers
should be checked monthly and cleaning with a damp cloth will extend the
life.
When
checking your blades:
Inspect
inserts for deformed contact areas, blades left in the park position will
roll the rubber causing adequate coverage one direction but not the other.
Check
for the rubber hardening due to heat causing chattering while in use.
Check
for separation or tearing.
If you
notice improper clearing at higher speeds you may have a weak wiper arm
spring.
Remember
quality wipers like original Subaru blades and refills not only last longer
but are also operate smoother and quieter.
