I use WD40 and a plastic putty knife to get all the residue off. Have a bunch of rags handy so as not to let much of the WD run down the car.
On another note, I was wondering if I could charge the dealer for the free advertising they try to get.
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If it ain't broke take it apart and find out why.
1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King
Ride in Peace Eric Peterson, Harley of Macon