Examine the bathroom vent for signs of eggs or chicks in the nest. If you observe eggs or chicks, you must leave the nest undisturbed until the baby birds mature and leave the nest. If you don't see or hear the chicks chirping loudly for food during the day, or observe a parent bird entering or exiting the bathroom vent for several hours, you can assume the nest is empty.
Remove nesting material that is within your reach with a wire coat hanger. Use a garden hose to push out excess nesting material. Pass the hose from the inside of your house through the exhaust vent hose until it appears through the exterior vent, pushing out nesting material and debris as the hose moves through the exhaust.
Apply a disinfectant to the exterior vent area after you have removed all the nesting material. Clean the area surrounding the vent thoroughly to prevent the spread of bird-related diseases.
Install exclusion devices such as vent covers, bird netting or bird spikes around the exterior of your exhaust. These devices will prevent birds from entering your bathroom exhaust.