The primary purpose of Four Thieves Vinegar is to provide personal protection from disease and magical attack, especially if the attack is ongoing and looks to continue for a time. 
It is used to strengthen you and weaken enemies, drive away unwanted people.
One of the most potent and powerful tools in magic. So potent that it can make or break any kind of curse.
To use Four Thieves Vinegar, simply dilute it in water and use it to clean your home, car, or workspace. You can also use it as a spiritual spray to cleanse and protect yourself, or add it to your bath water for a powerful and invigorating cleanse.