【How-to】How do i keep algae out of my bird bath

Dump out any old, stagnant water. Remove any large deposits of spilled seed, feces, debris or other contaminants. Use a solution of one part distilled white vinegar to nine parts water to scrub the birdbath thoroughly. Scrub the basin, lip, and any area of the birdbath where the birds can land, perch, drink or bathe.