I suspect you don't want the zinc sulfate that is commonly used throughout the area. Potassium salts of fatty acids is an alternative. These soap-based biodegradable products kill moss by penetrating the cell walls and changing the membranes so that the cells leak and the moss dies. These products are noncorrosive and pose minimal risk to humans and animals. As always, avoid overspraying adjacent plants, and rinse any plants that are accidentally treated. Thoroughly rinse any tools or equipment used to apply these chemicals. You can learn more with this publication we have written:
https://catalog.extension.oregonstate.edu/pnw733