Old Spice Odor Blocker. You will win. Odor will lose. Guaranteed. Odor Blocker devastates odor for 16 hours of freshness. In the shower, it banishes odor causing germs to the drain. It spends the rest of the day maiming pesky, yet unavoidable odor causing elements in sweat. After the carnage, all that remains is the FRESH smell of victory.