Exterminators are good. You could also check out your local hardware store for wasp spray. My dad always has wasps trying to build nests on his house, and he sneaks out at night, gives them a couple shots of poison, and voila, no more wasps.
Yours sounds a bit big for that tactic, though. Better get that sorted out before you use the BBQ. You'd have to fight them off with a flamethrower.
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