This is an age-old practice as well in Canada's Newfoundland. Famously in Canada, the resultant potion was called "screech" which maybe says it all. While screech could and has been made from Canadian rye whisky barrels, traditionally it was made by rinsing warm water in ex-rum barrels. Since rum is the classic Maritime Provinces spirit, it seems the most satisfying form of screech. A commercial version, based on good rum, is sold in Newfoundland, Ontario and other Provinces.