I'm sorry you guys are having this problem, and I know if it was me it would be really bothering me too......but it was just such a darn cute picture these little guys bringing those long sticks and stones thru the door
. It's like they are hunting/scavaging bringin in their finds......good thing they havent found a mouse yet
Spraying the rocks with that bitterspray does sound like a great idea...! Good luck