Many, many years ago I used that as an insecticide on some of my veggies, and it seemed to at least slow them down. Here's a post I found about Dr. Bronner's peppermint castile soap: "As a preventative mix 1 tablespoon Dr Bronner's Peppermint soap per quart water. Spray on vegetables on a regular bases or first sign of trouble. On specific pests mix 5 tablespoons per quart water. Test first on plant/bug to see if it is too strong or not strong enough." With aphids, I usually just use a strong spray with water from the hose.

Car oil is to heavy. Use Volck instead.

Why not use a good spray with the water hose? Once they are knocked off their mouth parts are ripped off. That and if your not squirmish just take and squish them on the spot with your fingers. No aphids here yet, but the garden is full of ladybugs.... Vera

Dishwasher liquid won't work, it's not soap. for it to really work you need real soap (it can't be called soap unless it is based on fatty acid salts - I learned that legal bit of info when I was making soap), the fatty acid salts are supposed break down the bugs cells. I like neem oil, but I hate the oily residue it leaves, don't have that issue with insecticidal soap. But then, I have tried everything to control aphids in the greenhouse, I have yet to find anything that kills them for good, (or for that matter, even puts a dent in their propagation) except tossing them out in sub freezing weather. Pam