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.