I have had luck with getting Ferretone out of clothing by saturating
the affected area with dish soap and letting it sit overnight before
laundering.  The trick is to completely dissolve the oils before it
hits the dryer where remaining residue will be 'set' forever.
 
Much depends upon the fiber content.  Cottons are much more receptive to
this, and if it is a dry clean only garment, -good luck!
 
Julie Fossa
FL (772)228-9067
OH (419)225-8158
West Central Ohio Ferret Shelter
http://www.wcofs.org
International Ferret Congress
http://ferretcongress.org/
[Posted in FML issue 5016]