[img]http://d.yimg.com/a/p/ap/20100222/capt.f6fd60c873e143c09c5b4a92bb2df749.braves_spring_baseball_aaron_gaatj102.jpg?x=130&y=92&q=85&sig=9VEutLSqybhQ0trj.Je4Fw--[/img]AP - Former career home run king Hank Aaron says Mark McGwire should have a clear conscience after his recent admission he used performance-enhancing drugs as a player.