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40 years ago I use to winterise Trailers in a park I used Windshield washer fluid and one oz. of mineral oil so it did not evaporate in traps and toilets .
Cottages in the country same thing to keep the mouse’s under control a five gallon pail 4 inches of windshield washer fluid and 4 oz of oil so it did not evaporate and a balance stick with peanut butter on end over pail .
Mouse walks out stick dumped in pail; and stick resets itself .
Put unit close to Couch so mice can get onto the stick.
Too many mice then use two pails MT them in the spring or big smell next summer .