Why not just dump a gallon or two of diesel fuel on it and burn it.
This would also be a good thing to do with any 82 Volvo, even if it wasn't infected with spiders

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J. William Tarbrake
NY State Dealer 7014303DLU
Registered repair shop R7014303
82 300SD modified for waste vegatable oil
92 300SE 270K miles perfect
79 450SEL (2 tone custom paint for special occations) SOLD
80 450SL
79 450SL 69K Miles FOR SALE
86 Carver 28 Voyager twin 270 Crusaders (SOLD)
94 CARVER 32 Voyager(SOLD)
67 Chris Craft 40' Aft Cabin(twin ford 427 side oilers)