I have had my trex about 7-10 years I am guessing. I was so excited, maint. free and all. Boy was I wrong. Still looks nicer than any wood deck but need to clean mold/mildew twice yearly is a pain and I have a very large deck. Today for the first time I used a power washer on low pressure with the cleaner that came with it "G Clean", didn't do much as far as I'm concerned, for mold mildew etc, NOT. Its cleaner but all mildew/mold spores are still there so i thought I am going to try a test area with vinegar/baking soda and see what that does, pretty much nothing again. I can deal with the way it looks as the spotting doesn't show when dry so thats good but I am looking into prevention more than anything now. Any luck out there? I want to stay as organic as possible and may just do vinegar and baking soda and see how it goes. Not feeding the mold/mildew is probably better than anything. I live in MN which can be very wet at times and my deck is East facing primarily with some South sun as it passes on by to set in the West. I love everything about my trex except the mold issues http://www.maids.com/blog/3-non-toxic-ways-to-clean-mold/

In search of 40 planks (16' x 5" x 1 1/4") - 293 sq. ft. in discontinued Trex 'Contour' Series - older Winchester Gray with wood grain surface. NOT newer 'Select' series (too dark & different dimensions). Prefer unused planks. Located in the Western States but can pick up or arrange for shipping. Sample of what I am searching for below.

I would pick a color that blends with the brick on your home either cool or warm tones depending on how you see the brick tones.

The black locust can be stained using a Sikkins product. It comes un-oiled It will age to grey like your cypress if you look on their website you will see at the Apple Cupertino offices as well as boardwalks the world over that they have supplied the wood for. But if you don't want to wait Sikkins makes a lovely grey. c ps the company is headquartered in Pennsylvania so not far from you. It only took a few days for shipping but it takes 6 weeks after you order to then ship.