Old Spice is announcing the Fifth Annual Top-100 Sweatiest Cities List to mark the first day of summer, and the top three from last year�s list have out-sweated the rest of the nation for a second year. Phoenix retained its spot as the nation�s No. 1 perspiration producer (it was No. 1 in 2005 and 2003), with the average resident losing 26 ounces per hour during a typical summer day. In less than three hours, the residents of Phoenix collectively produce enough sweat to fill an Olympic-sized swimming pool. Las Vegas remained at No. 2 in the rankings, and Tucson, Ariz., once again came in No. 3. The cities deemed the least sweaty were San Francisco, Seattle and Spokane, Wash. HOW TO BEAT THESUMMER HEAT: Water � Drink plenty of fluids, at least eight to 10 glasses of water per day. Choose Your Clothing Wisely � Wear lightweight clothing that breathes easily. Avoid dark colors and materials that encourage perspiration. Replace Salt and Minerals � Sweating removes the body�s salt and minerals. If participating in a strenuous activity where you anticipate heavy perspiration, drink fruit juices and sports beverages to replace lost minerals. Reduce Sweat Output and Stay Odor Free � Use an antiperspirant/deodorant daily, such as Old Spice Red Zone, which reduces the flow of sweat by up to 85 percent. Sweatiest Cities list