Do not use bleach, it will corrode your kegs. But as Mike suggests, replace all rubber parts and then an overnight soak in PBW should take care of it.
It's always time for a beer
On tap:Crabapple Brett Blonde, Cherry Brett Blonde, Rye Stout,Sour Porter,Oatmeal Stout, Amarillo Wheat, Saison, ESB
Primary:Pecan Smoked Roggenbier
Bottled:2006 crabapple cider,Cherry Brett,Black Braggot,2 Prickly Pear Meads(1996 and 2006),Sour Pumpkin
Lagering: Pecan Rauchbock
Secondary: apple cider vinegar
Next: Porter/Vanilla Bourbon Porter,