Change the water in the bird bath two to three times a week. Pour out the water and rinse the bird bath with clean water. This keeps harmful bacteria out of the bird bath.
Combine 1 part white distilled vinegar with 4 parts water. Allow the solution to sit in the bird bath for 15 minutes.
Scrub the bird bath with a nylon scrubbing brush to remove any lingering stains.
Pour the vinegar solution out of the bird bath.
Rinse the bird bath with clean water, and then fill it with fresh water.