The Problems

Streaking		Un-wiped Areas
Smearing		Chattering

The Causes

If rubber blade is cracked due to  wear aging . . .	If blade is deteriorated from sun, ozone and pollution . . .	If blade is torn from ice . . .	If there is too much play in the blade- arm assembly because of worn assembly parts. . .

Streaking
Streaking is the result of rubber that has dried, hardened and cracked. It can also be tree sap, road tar or other substances on the blade rubber.

Worn Rubber
Rounding of the wiping edge of the blade due to excessive use.

Chattering
This is a "chattering sound" resulting when the windshield wiper passes over the windshield. It occurs because of the "permanent set" or "curve" in the rubber. Blades usually become warped while the vehicle is parked and the rubber is stationary.

Split/Torn Rubber
This can be a result of the effect of the sun's ultraviolet rays and the negative consequences of ozone on the rubber causing the rubber blades to split or tear.

Shredded Rubber
This condition is usually caused by the excessive play found in loose fitting or worn adaptors.

Bent Wiper Frame
Washing your car in an automatic car wash is usually the cause of a bent wiper frame.