How to fix noisy/spattering windshield wiper of glc300
#2
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This is a common problem with the GLC. There is an extensive thread on this. Your windshield needs a good cleaning. Dealer should do this for you. I would clean wiper blades with isopropyl alcohol. Avoid rain x and spray wax in car washes. You should use a high quality window cleaner for automobiles that is ammonia free.