I teach chemistry and BKC can be neutralized by oxidation... that is exposure to oxygen or chemicals which act like oxygen. Chances are the active ingredient is already oxidized. However, if you are still concerned, a very very very dilute solution of bleach (which I know is also toxic to fish) but you can let that rinse out and use dechlorinators. Another suggestion may be to use Oxyclean, which is a non-chlorine based "bleach".
The vinegar is an acid, the salt is also a good idea, but not a strong enough oxidizer.
Good luck!
kcail1