Intergrain UltraPrep Timber Cleaner is a high-strength timber treatment that prepares timber prior to coating. This high-performance, bio-degradable formula is specially designed to be garden safe^ and will not damage surrounding surfaces such as exterior paint, metal or plastic^. Use Intergrain UltraPrep Timber Cleaner to remove surface contaminants prior to coating. The cleaner will help to restore and prepare weathered, grey, rust or tannin stained, mould or mildew affected timber to a clean appearance ready for coating. ^When diluted and applied as instructed and provided rinsed off immediately after contact. Rinse residue will not harm surrounding plants and grass.