Naphtha (Ronsonol lighter fluid) works.  It even states on the label,
"Excellent for removing labels, tar, grease & oil stains".

Mike

JordanVw@AOL.COM wrote:
> on another vehicle i have someone broke the rear glass and the PO duct taped
> a tarp over the hatch..  how does one get the resitual  duct tape gummyness
> off the paint without harming it?
> thanks..
>
> chris
>