Read the instruction manual or sheet that came with your fountain, if available. If you don't have one, call the manufacturer to inquire about special cleaning methods that may be required for your specific fountain.
Unplug the fountain pump.
Drain the water from the fountain. Use the fountain's drain plug, if there is one, or pump it into a bucket with your fountain's pump and a long piece of tubing.
Remove any debris that is left inside, such as twigs, leaves or grass.
Wipe the fountain surfaces thoroughly with a rag, using an old, soft-bristled toothbrush to gently scrub detailed areas or algae spots. White vinegar may be used to remove stubborn algae growth or discoloration caused by dirt and mud.
Rinse the fountain surface with a hose.
Pull the cover off the fountain pump and remove any debris that may be trapped inside.
Wipe the inside and outside of the fountain pump and replace the cover.
Perform any extra steps that may be recommended in your fountain instruction manual.
Re-fill the fountain with water, adding water treatments to prevent algae and mineral stains as directed on the bottles.