My timber decks have gone grey, I suppose theres no alternative but to paint them now?
No, you can revive the natural colour of the wood by using a wood cleaner and brightener such as Cabot’s Deck Clean. A product designed to be diluted, scrubbed onto the surface, left to stand and then rinsed off. Not only will it rejuvenate the colour of the timber, but will help to remove the dead grey fibres and any mould, algae, mildew and tannin staining. Once dry you can then apply a semi-transparent decking product such as Cabot’s Decking Oil or Decking Stain.