If you wet down the vehicle and use diluted car wash soap in a spray bottle you won't strip the wax.
Stick a couple paper towels in the underdash floor vents to check for ventilation system water or A/F leaks.
If you still can't find it, let me know and I'll post a long and drawn out method to find the leak that doesn't use powder. Powder is messier, but quicker. Be ready to pull your front interior.
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