Had the same problem with our 97 C280. Remove all of the velcro strips from the top. Should stop the problem.

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1988 Mercedes-Benz 260E (W124)
Arctic White/Grey MB-Tex
Debadged
Euro Headlights
1994/1995 Turn Signals and Taillights
16" x 7J 8-hole (Authentic MB)
Michelin Pilot HX MXM 205/55WR16