Z-Deck Cleaner™ is a 4x-concentrated, heavy-duty, nonskid fiberglass cleaner formulated with ZTP™. ZTP™ is a powerful bonding polymer that not only cleans, but also helps to protect your fiberglass and nonskid decks. It will loosen and lift dirt and stains without heavy scrubbing while leaving a polymer protective coat behind to stop dirt from penetrating the surface. Z-Deck Cleaner™ will not leave your decks slippery after rinsing with water. It is nontoxic, nonflammable and biodegradable. Formulated and bottled in the USA. Quart.