Sweep any loose debris off the yard ornament, using the broom. You want to remove dry debris before washing to prevent it from becoming mud.
Scrub the concrete with soapy water, using the soft scrub brush. Use a toothbrush to get into any nooks and crannies.
Treat grease, paint and rust stains with a commercial cleansing product. Allow the product to soak into the stain for 15 to 30 minutes.
Use a power washer to give the ornament a final wash, removing any residual cleaning products. The high-powered jet of water will not be enough to damage the concrete but will blast away any stubborn debris.
Allow the concrete to dry.