From ESPN's list of "biggest cheaters in baseball":
6. Whitey Ford (pitcher, Yankees, 1950-67)
Ford used his wedding ring to cut the ball, or had catcher Elston Howard put a nice slice in it with a buckle on his shin guard. Ford also planted mud pies around the mound and used them to load the ball. He confessed that when pitching against the Dodgers in the 1963 World Series, "I used enough mud to build a dam." He also threw a "gunk ball," which combined a mixture of baby oil, turpentine, and resin. He kept the "gunk" in a roll-on dispenser, which, the story goes, Yogi Berra once mistook for deodorant, gluing his arms to his sides in the process.