c280 with one wiper blade mechanism is working too slow and sticks anyone knows what is wrong Derek

 

Yes, its one of the most common problem with this mechanism. Get a white lithium grease from Auto Parts store and take apart the plastic shield and lubricate the 2 piston cylinders. Do a search, I saw complete instructions for this and did it by myself 2 yrs ago and still works. If I'll find the instructions I'll post a link... but pretty easy stuff...