Experimented using WD-40 (aerosol lubricant) to nuke drywood termites,
and seemed to work. First squirted in their holes where they were
ejecting granules. A lot of fluid missed going into the hole, so on the
single ejection hole that formed somewhat later, a soft piece of
cardboard was cupped to direct all fluid inside. Boy, did that hole
suck in petro-cocktail, by capillary action or whatever.
Well, no guarantees, but their long period of activity seems to have
come to a halt. Only dared tried it because that furniture was the only
worthwhile stick of wood in a concrete structure. And official drywood
termite treatment is expensive and inconvenient (remember drywood
termites are TOTALLY different than the more typical kind of termite
which require moisture, mudtubes etc).