Tried a 50/50 mix with 90% rubbing alcohol and water. I soaked the heck out of some leaves and it did no damage. Kills bugs, but won't prevent their return.
This isn't new information, but it may be helpful to someone.
Flea Beetles! I found them in my wife's nasturtium's so I sprayed them and pulled them up. The thousands of beetles that escaped went to my plants. I have killed almost all of them by various means. The alcohol mix, I use in a spray bottle between treatments with other organic insecticides. They are a bit larger than a pin head and jump like a flea. They destroyed the nasturtium's