Teak turns silver-grey because UV destroys the surface lignin, the natural polymer that binds the wood's fibers. The grey layer is thin, which is the good news: under it, the golden teak is still there.
Restoration is the process of removing that dead layer cleanly and then protecting the fresh surface. Done right it is transformative; done wrong it chews years off a deck's life.
Step one: clean
Start with a dedicated teak cleaner and a soft brush or pad, scrubbing across the grain, never with it. Scrubbing along the grain digs out the soft summer growth between the harder grain lines and leaves the surface ridged.
Rinse heavily. A one-part cleaner handles normal weathering; a two-part cleaner is stronger but harsher, and should be the exception rather than the routine.
Step two: brighten
A teak brightener is a mild acid that neutralizes the cleaner and restores the wood's warm color. Apply to the wet deck, let it work briefly, and rinse until the water runs clear. This is the step where grey visibly turns gold.
Step three: sand, if needed
If the surface is ridged or stained past what cleaning fixes, light sanding levels it. Teak is a finite resource on your boat; every aggressive sanding permanently thins the decking, so sand as little as possible and never with coarse grits.
Step four: protect, or don't
You have three honest options: leave it bare and let it grey gracefully with regular cleaning, oil it for rich color that needs reapplication through the season, or seal it for longer-lasting protection with less upkeep. What kills teak is not choosing any of these; it is neglect punctuated by aggressive rescue jobs.
Teak finishing and restoration is one of our core marine detail services. If your deck has gone grey, we come to you, assess whether it needs a clean-and-brighten or a full restoration, and quote it before touching the wood.