Any areas that typically have standing water are susceptible to mold growth. This is because mold grows easier and faster in areas that are continuously moist. This includes an outdoor water fountain. When the weather is warm and the humidity level in the air is high, mold is even more likely to grow. This is also the type of weather where more people are likely to be using the outdoor water fountain, meaning that keeping it clean and free of mold is very important.
Things You'll Need
Mix together a cleaning solution of warm water and several drops of dish detergent in small container. Mix it up to get suds in the water.
Scrub out the inside of the outdoor water fountain using the detergent solution and a scrub brush. Be sure to scrub away all visible mold.
Rinse the water fountain thoroughly with clean water.
Add 1 gallon of water to a bucket and 1 cup of bleach. Mix the solution together.
Put on rubber gloves before touching the bleach. Add a large sponge to the bucket and let it get saturated.
Wipe down the entire outdoor water fountain with the sponge. Add more bleach solution if necessary.
Let the bleach solution sit for a few minutes to kill all remaining mold spores and disinfect the fountain.
Rinse the fountain with a hose if possible. The fountain should be rinsed two or three times to make sure all the bleach is completely removed.
Do not use bleach and ammonia cleaning products together. The result is a toxic gas that is highly dangerous.