 Included with the release of WWE SmackDown ! vs. Raw was the option of fighting " dirty " or " clean " . When players select " dirty " , the superstar is booed by the audience in the game ; conversely , the " clean " superstar is cheered by the audience . With the " dirty " or " clean " option comes the inclusion of performing a special maneuver when playing . Players using a " dirty " superstar must direct their superstar into building up their " dirty " meter by performing " dirty " tactics , such as attacking the referee or taking the pad off the ring 's turnbuckle . Unlike performing dirty tactics , " clean " superstars build their meters by performing " clean " tactics , such as an aerial <unk> or performing a taunt . When " dirty " superstars ' meters build up , they are able to perform a signature low blow ; likewise , " clean " superstars can perform their signature move at double its normal damage . 
