At least once a year, but preferably twice a year the birdhouse needs to be cleaned out. Tap on the house and listen for activity inside. Carefully shine a flashlight inside to make sure there aren't eggs or chicks inside. Always look from the corner of the house diagonally in through the hole as a startled bird may fly straight out. Once you are sure the house is not in use, open whatever hatch is provided and pull out the old nesting material. Use gloves and wash thoroughly afterwards.