The lower half of the back of our house was cladded in decking wood about 10 years ago - we moved in last year and the wood has not been treated, ever - old photos show it was bare untreated wood when fitted. It has completely discoloured / greyed, and it is a bit warped. It's also very dry. I would like to treat the wood to try and preserve it rather than rip it all off and start again.
Any tips / advice on treating dry / discoloured / unloved outdoor decking would be appreciated!