You have nothing in the rear of the vehicle which would leak anything else but gasoline.
More than likely you've got either a leaking Trunk Seal, a leaking Tail Lamp assembly or a leaking Rear Window.
If you pull up the spare tire cover, you may find your reservoir; in the spare tire well.
#1 '97 CD7 SE Accord Coupe San Marino Red / #2 '96 CD7 LX Accord Coupe Arctic White / #3 '96 EJ8 EX Civic Coupe Black / #4 '88 LXi Coupe (spare)
One more "What's the Top Speed..." thread and I think I'll flame someone