Wood siding is beautiful, if it's kept up. If you hear a painter say they'll do a pressure wash, light sand and apply some stain, expect to keep up on maintenance more frequently. In an application like this, we go through a 7-9 step process with washing, sanding, wood brightener to remove tannins, wood conditioner, layers of stain, and layers of finish to provide what could last 10+ years under the right conditions before needing attention again.