Porta-Pak Max Mint from Walex Products leaves a scent of fresh mint in portable restroom holding tanks. It contains twice the fragrance, 50 percent more odor control and more blue color than regular Porta-Paks. It is a super-concentrated formula, packaged in easy-to-use portioned packets that are dropped in the tank and dissolve quickly. 800/338-3155; www.walex.com.