We had a Trex deck installed in 2004. We choose to use the non-groovey side, Winchester Gray color. The deck is not slippery and cleans easily when power washed once a year. In the Spring of 2014 we needed to retrofit a small section of the deck and purchased four 16' gray Trex boards which now can ONLY be used on the groovy side. The other side is a blackish finish. Had them installed and now have a major issue. This section of 2014 TREX IS SLIPPERY. We notified Trex via email. They notified us back via email that we should use their 'Trex strips to make it less slippery' They have these readily available for their stairs! The 2014 product is so slippery just having wet shoes makes it an issue when walking across it. Bad enough they make a slippery product, but they ADMIT they have a FIX for IT??? Sounds like a class action suit needs to be established for this issue as well. This product should be removed from the market. It is extremely dangerous for all ages because it is so slippery.