When you remove the trash bag after letting the bleach water soak, your bird bath will look like new. If there are still remains of algae or scum in the basin, replace the trash bag and let it soak longer. Otherwise, discard the trash bag or save it for reuse – the same bag can be used every time you need to clean your bird bath.
It is important not to leave the bird bath untended at this point. The clear water and full basin can quickly attract thirsty birds, but the high chlorine levels in the water can be fatal. Instead, drain the water immediately. Avoid dumping it directly on grass or plants, but feel free to dump it on weeds or in an unused area of your yard. As with your first water dump, avoid draining the chlorine water near bird feeders or spilled seed.
