PESTGUARD Rodent Repellent Balls (4 Pieces)They're Already Inside Your Home. Here's What Gets Them Out. "We had mice in the attic every single winter. Scratching, droppings, the lot. I placed four of these up there in October and didn't hear a sound all season. Nothing to clean up, nothing to deal with. The dog hasn't gone near them either." Sinad Burke, Cork (47) They're In. This Gets Them Out. Most repellents assume the problem hasn't started yet. If you've heard scratching above the