Once you have mounted your bird house for the first time, you need to start closely monitoring it each week. Bird houses can attract disease and parasites if not cleaned appropriately. Never clean or remove a nest that is made in the bird house because you don't want to disturb any eggs or babies. Once the babies leave the nest you should remove the nest and carefully clean the bird house. It's important to clean the bird house to prevent the spreading of salmonellosis, trichomoniasis, avian pox and aspergillosis.
Check the bird house before you clean it to make sure there is no nest in it. Monitor the nest for at least one week before cleaning it. Make sure the bird house is not overcrowded with birds. If you see too many birds in it at once, you might want to consider placing another feeder in your yard, which will also give the birds a place to go while you clean the bird house.
Put on latex gloves and cover you mouth with a surgical mask before you go to clean your bird house. Spray the bird house with hose before cleaning inside it with your hands. Use a high-pressure nozzle and to spray carefully so as not to hurt the wood on the bird house.
Fill a large bucket with warm water and dish soap. Soak a sponge in the bucket and then scrub all areas around the bird house. Some bird droppings might remain but try to remove as much dirt and waste as you can.
Spray inside the bird house again with high-pressure water and also spray the areas around the bird house. Spray bleach if there is still bird waste in the house or on nearby cement. Use the soap and water again to clean off the bleach and the spray the bird house again.
Disinfect the bird house at least twice a month. Also, remove any moldy seed, breed or leftovers in the house at anytime to prevent insects and other pests.