Hello from Atlanta--try Goof Off solvent---sold in hdwre stores and
HomeDepot--to remove old duct tape residue.  Just spot check to see if it
is not taking off finish.  I had tailgate gasket held on with duct tape,
and goo was everywhere, on rubber gasket and on painted surfaces.  Goof Off
did a flawless cleanup of both surfaces.  Fumes are awful, so do this
outside on a nice day.  Oh yes, the little 3 ounce can costs about $3.-,
but in the Home Depot paint dept they have two 8 oz. cans for $6.-......

Regards, Christina and Mike Nichols
2-'81 Vanagons