Teak wood contains natural oils which help prevent it from rotting or deteriorating in the marine environment. Unfortunately, these oils also cause teak to turn gray or black due to mold and mildew feeding upon the oil.

Why has my teak outdoor table got black spots?

Black spots on the product after being exposed to the outdoor environment are a result of humidity build up in the wood and are natural mold spores. These spots can be cleaned, and should not be considered a defect. … You must clean all teak product on a disposable plastic or thick fabric drop cloth.

How do you restore teak that has been stained?

Use a combination of mild soap and water, such as liquid dish-washing soap, toclean the surface of your teak table. A few tablespoons of detergent diluted in 1 gallon of warm water is sufficient. Use a soft scrub brush for removing stubborn grime, and rinse the surface with a clean, damp cloth.