Is there a product to remove green marks off tanalised wood?

Yes, there are products available to remove green marks from tanalised wood, often caused by mold or mildew. A mixture of water and vinegar or a specialized wood cleaner can be effective. It's important to test any cleaning solution on a small, inconspicuous area first to ensure it doesn't damage the wood. Additionally, using a soft brush can help lift the stains without scratching the surface.