For 1990-2009 cars

# CHATTERING WIPER BLADES CLEAN BLADES/GLASS

#### VEHICLES AFFECTED: ALL MODELS

Windshield glass and wiper blade elements may become contaminated by insect residue and/or wax left on the glass after a car wash. This can cause chattering wiper blades and/or uneven wipe.

To correct this condition, clean both windshield glass and rubber blade elements as follows:

1. Clean windshield glass with a glass cleanser that will not harm the paint finish or scratch the windshield. One such product that can be used is GM Glass Cleaner or Bon Ami* "cleaning powder" or equivalent. The glass is clean when the rinse water no longer "beads-up" but "sheets" across the entire glass surface.

2. Clean wiper blade elements using a cloth or towel that has been saturated with a solution of 50% water and 50% GM Opti Kleen or a solution of 50% water and 50% methyl alcohol. Rinse the wiper blade with water and reinstall on the wiper arm.

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General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.