Starbrite Toilet Bowl Cleaner/Lubricant Removes stains and water deposits from bowls quickly and easily. Safe and easy to use. Excellent for all plastic and china bowls. Specially formulated for marine heads. Will not damage seals or valves. Contains no harsh chemicals. Kills odors - leaves bowl fresh and clean. No hard rubbing or scrubbing required. Will not interfere with the action of most holding tank treatments. 16 oz.