Fortunately, it can be simple to clean a bird bath without scrubbing if you follow the proper steps. This technique will take 20-30 minutes total, though for much of the time you'll be able to attend to other tasks as the bird bath cleans itself. While the basic technique is suitable for bird baths of any material, it is most effective on concrete bird baths. If your bath is unique and delicate, take precautions to protect it before trying this technique.
Materials you'll need…
Hose with pressure jet setting
Black plastic trash bag
A very dirty bird bath!
Step 1: Dump the Water
The first step in cleaning a very dirty bird bath is to get rid of the contaminated water. This water is often filled with organic material such as feces, algae and dirt, and it is safe to use to water nearby flowers or plants. Dump the water out in an area where it will be recycled to help the rest of your garden, but treat the basin of your bird bath carefully to avoid damage. If the basin of your bath does not detach, simply tip the pedestal to drain the water onto nearby plants or grass.
To safeguard your birds from this dirty water, avoid dumping the basin near bird feeders or spilled seed that ground-feeding birds may sample.