Fill the pump sprayer with clean water.
Saturate the gravestone with water from the pump sprayer.
Gently scrub the stone with a soft brush. Don't use a previously contaminated brush. Scrub in a random circular pattern with multiple sizes. Begin at the bottom and work your way to the top of the stone.
Rinse and check for flaking. It is important to rinse often to make sure that you aren't damaging the stone. You will want to rinse the stone before it dries as you are cleaning, to avoid streaking.
Scrub the letters and numbers with a toothbrush, sweeping gently back and forth, removing residue out of the lettering.
Rinse the entire gravestone with the sprayer.
Use the plastic scrapers to gently scrape away biological growths or activity attached to the gravestone.
Rinse the gravestone.
Repeat steps 2-8 until the gravestone has all undesired deposits removed.