2nd story Timbertech deck w/redwood posts, railing, etc

Hi,

Replaced 4' x 40' balcony (2nd story) in - San Francisco area (East Bay) California in August of this year. The Deck is Timbertech and the posts (Roof to ground), facia boards, railings are all beautiful grade B Redwood.

I've tested Armstrong, TWP and Cabot's semi-transparent stains on the spare redwood and left them outside for the last two months. All of them absorbed the wood well and look good.

We've had unusually warm/dry weather for the last 2 month's but that's going to change soon (it's now early November).

What I'm struggling with is the recommended cleaning/brightening. Since the deck itself is composite, do I still need to clean and brighten (RAD)the posts, facia and railings? If so, will RAD damage the Timbertech? The deck receives morning sun only.

I really love this site, so glad I found it!

Maryanne