Zep Outdoor Foaming Cleaner & Brightener is a bleach-powered formula designed to eliminate stains caused by mold, mildew, algae, and outdoor grime. The foaming action clings to vertical and uneven surfaces, allowing for better contact and improved stain removal. Safe for use on concrete, vinyl, plastic, and non-painted wood, it’s ideal for patios, decks, siding, outdoor furniture, trash cans, and garden tools. This ready-to-use cleaner begins working in just minutes and rinses away easily.