Gonna try this here
White vinegar and water. 1/3rd vinegar to 2/3rds water to start. May have to increase % of vinegar based on persistence, but I keep the same level for a week or two, and don't alter it if the barking is decreasing. Put inside of a strong squirt gun or sprayer. The $.99 sprayer at home depot DOESN'T do it. Get the $4-5 one. Hit them right in the face with it. It takes their breath away. May sting a little but don't damage them. Be consistent and as persistent as they are.
They will smell like vinegar for awhile, but who cares?
All right I think I got it