How do you clean serface

Prep Be sure surface is free of all dirt, mildew stains, loose wood fibers and other foreign matter. In order to be effective, a stain must be able to penetrate. Surfaces must be sound and may be dry or damp. If damp, the wood should be free of puddles and not feel wet. Prepare previously stained or weathered surfaces with Valspar® Wood Cleaner or Valspar® All-In-One Wood Prep. On untreated weathered surfaces, it is best to pressure wash, but at minimum, scrubbing with a stiff bristle brush and rinsing with a garden hose should be done to completely remove all loose wood fibers. Sanding is best to remove any loose wood fibers.