It allows intensive cleaning of the wood, removing stubborn dirt and residues of previous oil-based or impregnating treatments. It is also used to degrease exotic timbers particularly rich in oils and extracts. In this case it is recommended to dilute the product with water 1: 1. Wet the substrate with plenty of water before treatment. Due to the high concentration of active ingredients, Extra Strong Wood Cleaner can alter the natural color of the wood making it darker. To restore the original color of the wood, use Exterior Wood Cleaner later.