You probably could have used the juice as priming agent. For a wheat beer six points sounds about right to get the right volumes co2.
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Triple rinse after pouring is my method. Fill it about a quarter of the way, shake, empty, repeat 2 more times. Seems to work well.
I do this. I basically rinse/shake/empty/repeat until the rinse water runs clear, then rinse one more time. Still, the OP's finding makes me want to do a QC check on a dozen bottles or so to ensure that I'm not missing anything.