Remove any pet stain substance from your concrete with a scraper. Dispose of the waste properly.
Cover the pet-stained area with a pet odor neutralizer that has enzymes. The enzymes break down the odor-causing bacteria in the pet stain and absorb them. Allow the pet odor neutralizer to sit on your concrete for five or six hours, then sweep it up with a broom and dustpan.
Mix a pet stain cleansing solution of 1 oz. of trisodium phosphate, 1 cup of warm water and 1 cup of talcum powder. Apply the paste in a thick layer over the pet stain on your concrete and allow it to dry and harden for 24 hours.
Scrape the trisodium phosphate paste off your concrete with a scraper and throw it away in a garbage can with a lid where children or pets cannot get to it. Wet a scrub brush with plain water and scrub the site of the pet stain on your concrete. Rinse thoroughly with a hose.
Sprinkling baking soda over the stain if it remains. Pour enough white vinegar on the baking soda to make a thick paste. Allow the vinegar and baking soda paste to sit on the concrete for 10 minutes.
Remove the baking soda and vinegar paste with a scraper. Scrub with a damp scrub brush, then rinse with a hose and allow your concrete to air-dry.