On Wed, 21 Jun 2017 06:08:59 -0700 (PDT), wrote:

Our Trex deck is 5 years old and is sable brown. We have boards that are turning white and other boards turning black. What the heck can be done to get my color back. I have washed it as recommended and in a few hours it is back. I'm lost as what to do. I've even used the stain recommended and it comes back right away. Any suggestions? Very frustrated and tired!

Contact the manufacturer, they offer a 25 year warranty, see:

http://www.trex.com/trex-owners/warranty/