Joined the dark side. :D
How about vegetable oil? Don't think i ever use mineral oil.You want to know what I've found to be the cheapest, most effective, yet ecologically sound bug spray?: Mineral oil. No bullshit, follow....
Years ago I bought a bug spray--the kind you attach a spray bottle with the bug liquid to your hose--at Armstrong Garden shop called Safer Insecticidal Soap. Shit was the bomb. Downside was it was expensive. Me being me, I thought I'd look into the product and see if I could find it cheaper or else produce something similar myself. I took a look at the ingredients right off and found it was like 90% "vegetable oil" and the remainder water. Digging deeper it turned out the oil was actually mineral oil. Well, after that, I started buying mineral oil bottles at Walmart for $1 per 16 oz., used that to refill my Safer bottle, and it was certainly the same damn thing only ten times cheaper. I've never looked back.
I use mineral oil from the sprayer on everything from tomato hornworms to rose aphids, and everything in between. Clean, effective, cheap, and safe around kids and animals. How can you go wrong?
Ya, I don't have such oil and never needed. I'll stick with vegi.