What happens next?

How to clean a wood fence
Cover the ground around the fence with plastic.
If you have plants you care about or you decide to use a chemical cleaner, you'll want to cover the area around the fence with plastic. Go to your local hardware store and purchase enough plastic sheeting to cover the plants and grass up to at least 3 feet (0.91 m) from your wood fence.
Purchase just enough plastic for one section and move it with you when you move to the next to save money. Remove heavy debris with a wire brush.