I just looked at the enlarged photo of your deck. It has really grayed! I would first try removing the gray with oxylic acid, such as Behr's 2-in-1 Deck Cleaner. Behr's is only found at Home Depot. It normally will totally remove the gray if directions are followed. If it does not, it is probably because of the silicon remaining on the wood. As I noted above, this is precisely why I do not care for Thompson's. The wood turns gray, but still repells water! If this is the case, it is back to chemical strippers or sanding.