Cleaning a bird house
Clean a bird house once nesting is over and the box is empty: take out the old nest and scrub the box with mild detergent and water, or with 1 part bleach to 10 parts water if it is soiled, as NestWatch advises. While birds may still be using it, leave it alone; if you cannot tell, wait. For bluebirds, NestWatch also suggests taking the old nest out after each brood.
When to clean it
NestWatch’s general advice is to leave the nesting material while the breeding season lasts, then clean the box once nesting is over and the nest is no longer in use. Its bluebird page goes further and suggests taking the old nest out after each brood. Both start from the same rule: only when the box is empty. If you are not sure whether birds are still using it, wait.
How to clean it
Once you are sure the box is empty:
- Open the hinged side or front.
- Lift out the old nest.
- Scrub the inside with mild detergent and water. For a soiled box, NestWatch gives 1 part bleach to 10 parts water; it gives no soaking time.
- Close the panel and check that the latch holds.
- In a flicker box, put in fresh white pine chips before the next nesting season.
A nest box is not a feeder
Feeder cleaning uses a different mix: our feeder guide follows Project FeederWatch’s 1 part bleach to 9 parts water, a 10-minute soak and a rinse. Keep the two apart: NestWatch’s 1 to 10 for a soiled nest box comes with no soaking time.
Checking on a nest
NestWatch’s monitors look in every 3 to 4 days and stay less than a minute. They skip early mornings, bad weather and dusk, stay away early in incubation and in the days before the young leave, and watch from a distance when going closer would disturb the birds.
That is a routine for people who record nests for science, not a schedule for every box: you never need to open a box to enjoy it. Leave eggs and young untouched.