The Curve long-lasting air freshener from Century Chemical has a versatile holder that allows placement almost anywhere. It freshens while remaining hidden on the side of portable restrooms, inside bathroom cabinets, and on the underside of wastebasket lids. The holder is held in place with two-sided tape, and the unit is replaced each month. Date tabs allow the technician to choose when to replace it. It is recyclable and available in spiced apple and citrus fragrances. Each case will supply six restrooms for a full year. 800/348-3505; www.centurychemical.com.