Every household has their own spring cleaning rituals. At the Ruppel residence, it’s yard clean-up. Uncovering gardens, picking up branches and disposing of doggy “deposits” are necessary tasks my wife and I complete each year. Although it’s not always fun, it’s important if we want to enjoy our yard during the all-too-short summers in Minnesota. Just like a house needs to be cleaned with some regularity, direct mail lists need to be cleaned regularly too. After all, proper list hygiene is....