killer on the loose

In my unending attempts to eliminate toxic chemicals from our home, I have searched a long time for a natural weed killer.  When the dandelions are winning the war in my yard, I can't pull then all.  I found this recipe on Pinterest and it does work, mostly.  With the cool damp weather we have had lately I will need to reapply to a few places.
1 gallon apple cider vinegar
1C salt
1T Dawn
Mix together and pour into a sprayer.  Apply to weeds on a warm dry day, they should be dead by that evening, if not reapply the next day.