Pride Plumbing was called out for an odor coming from the water at a bathroom sink. We first tested the water coming from the water heater but did not detect an odor in it. Next, we removed the bathroom sink's aerator and discovered mold and mildew in it. We cleaned it the best we could and reinstalled it. We advised the customer to take out the aerator and let it soak in vinegar about once every six months.