Some "Sevin" sprinkled around outdoors might help. We had really bad carpenter ants in Ca and that seemed to help. Some mornings there would be little piles of sawdust from the ants in the wood ceiling.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT