Safe for most any wood. Feron's wood cleaner washes away years of weathering and restores the natural look and beauty of the wood on a one-step process. It is intended for unfinished wood surfaces only. The wood cleaner gets rid of: oxidation, mold, mildew, and the "grey" look. It can be used in conjunction with the Feron Wood Sealer/Preservative to create a long- lasting solid seal to outdoor wood furniture and product