You mentioned a flexi lead. Take the dog off that right away - that is your first problem! Flexi leads have absolutely no purpose in my opinion.
Laika had aggression and used to rush other dogs. You stop this by learning your dogs posture when she is starting to get excited. Then you have her sit in front of you and watch your face. Treats for when she looks at you. Once the dog has passed, you continue on. A choke chain is to teach a dog to walk on a loose leash. It is not a miracle tool.
Work hard to work with us on this, and articulately explain what is going on. You are obviously frustrated with your dog, but there is no reason to be drastic in your training methods. We will be able to help you if you stay polite and ask genuine questions. If you are really looking for answers, you will be willing to take our advice!
Laika had aggression and used to rush other dogs. You stop this by learning your dogs posture when she is starting to get excited. Then you have her sit in front of you and watch your face. Treats for when she looks at you. Once the dog has passed, you continue on. A choke chain is to teach a dog to walk on a loose leash. It is not a miracle tool.
Work hard to work with us on this, and articulately explain what is going on. You are obviously frustrated with your dog, but there is no reason to be drastic in your training methods. We will be able to help you if you stay polite and ask genuine questions. If you are really looking for answers, you will be willing to take our advice!

.
Listerine isn't meant for humans to swallow. I don't think I would want my dog to be licking it. It does have alcohol in it. 