Perma-Chink Wood ReNew is a biodegradable percarbonate-based wood cleaner that cleans and brightens grayed and weathered wood. Use it to return wood to its original natural color before applying any of Perma-Chink's quality wood finishes. Wood ReNew contains a thickener that helps it adhere to log walls and siding. Wood ReNew removes dirt, mold, mildew, water stains, and UV damage and leaves the wood with a new, fresh look. Learn more about Perma-Chink.