Canvas GP tents.
C-4, the fresher the better (yes, they DID manufacture some after 1968).
Canvas GP tents.
A newly-opened can of Kiwi shoe polish.
Zippo lighter fluid.
Hoppes No. 9 bore cleaner.
What about you?
There's a Folger's plant down the street from where I work. In the morning the whole area smells like roasting coffee. mmmmm