This makes the water slightly acidic, killing algae without harming birds. · birdbaths are susceptible to slimy green algae growth if theyre not cleaned properly. Use apple cider vinegar to clean and prevent future algae. Even if a tiny trace is left behind, it won’t poison the birds—they just might turn up their beaks at the sour taste! For best results, spray with pressurized water from your water hose to blast away any remaining algae. Drain the water and rinse well with clean water. Clean your bird bath naturally with vinegar. Add 1 teaspoon per gallon of water to prevent algae growth. You can also try these tips: · mix 1 tablespoon of apple cider vinegar per every gallon of water, and scrub the birdbath with the solution for about five minutes. Rinse well after. Vinegar is a great natural solution to removing algae from a bird bath. Apple cider vinegar is a safe and effective way to combat algae in your bird bath. · vinegar is effective in killing algae in bird baths and can be used during the regular maintenance cleaning of the bird bath, between refilling, explains sunny kellner, wildlife rehabilitation manager for sharon audubon center. · it dissolves mineral deposits (white crust), kills algae , and breaks down grime. It takes approximately 10 – 15 minutes for the vinegar to kill the algae, depending on the strength of the vinegar solution and the resiliency of the algae. Remove tough scale and algae effectively while ensuring a safe, residue-free environment for birds. For cleaning, use a 50/50 vinegar and water mix to scrub the basin.