Restoring an old wooden fence really dresses up your yard. This article will give you all the details on how to restore your wooden fence. I recently restored 103 linear feet of 6 foot tall treated picket fence (one side only). The first thing to do is power wash to remove dirt, mildew and the loose wood fibers. I used a 2700 psi washer with a 15 degree tip, keep off the wood 10” and clean with the direction of the wood. I cleaned one half of a picket per swipe. Be careful not to splinter the wood.