I "think" I know this one.
Ultrapac won't loose it's efficacy.
I'm not positive what's in PB, but I believe some of the ingredients will loose some efficacy and others in it won't.
So PB will still be "somewhat" effective if left in the sprayer over night, but not at 100% efficacy.
Same with other juices, it depends what's in them whether they loose some efficacy or not.
Maybe Shawn "Da Brain" Forsythe will see this and add some knowledge from his over large encyclopedic temporal lObe ...
and hopefully in language I can understand
..L.T.A.