What damages? Would be no different than pouring water into the gas tank. Bleach out of the bottle is 15% bleach and 85% water. Car just stops running.
Gas tank is drained of fuel and contamination(bleach water) and refilled with gas and car is started again.
. I would say your ex girlfriend should study up on how to fawk up your car real good(slowly and effectively destroy it) not that they are that in vindictive because a car is "just a thing".
. She has other ways to destroy you life IMMEDIATELY : your reputation, your following, your looks, your self esteem, your pride, your sexual preferences.
. Stories get around like wildfire.[esp juicy untrue gossip]
Besides, she would know what is LEGAL & what is Vandalism.
. Insurance may get involved but only if you are insured before the event happened;so see, the girl friend can hurt you financially because you now have to spend money on insurance for a possibility it may happen.
. Charging her with vandalism:you have to have PROOF.You won't get that because girl friend is smarter than you.
No wonder she dumped you.