06-17-14 04:55 PM - Post#169171 In response to ConserveNature
Changing them once a year is good before the inspection or if they chatter or don't wipe evenly, replace them.
If the rubber is torn or separated it will not pass, otherwise it's OK. You'll have to buy the refills in pairs so if one wiper is an 18" and the other is a 24", you will have to buy a pair of each. Save the spares for next year.
