My cat Noodle loves to drink running water, so I've provided Her Majesty with a cat fountain. However, mildew seems to get around the edge of the pool of water that receives the fountain flow, above the water line.

Anyone have ideas about how to clean or prevent that mildew without using something harmful to kitties? I've tried just soap and water and rinsing well, but that hasn't been enough.

Many thanks for any ideas!