In small saucepan, combine soy sauce and apple juice concentrate.
In small bowl, combine mustard, ginger, cloves and garlic powder.
Add 1/4 cup of soy-apple liquid to spice mixture; blend thoroughly.
Stir spice mixture into remaining liquid in saucepan and bring to boil over medium heat.
Place chicken in large shallow glass dish.
Pour marinade over chicken; turn to coat with marinade.
Cover and refrigerate at least 8 hours or overnight.
Drain chicken; reserve marinade.
Lightly oil grid.
Grill chicken, on covered grill, over medium-hot briquets 1 to 1 1/2 hours or until fork-tender, turning and brushing with marinade every 15 minutes.