I use 70% rubbing alcohol straight out of the bottle. You cannot use it in the heat of the day or it burns. It works on most things. Simple green works too.
Inside the house I use windex, 409, and tylex on bugs. The only thing it doesn't kill are the soldier ants, they are a tougher breed of ant but the workers die quick. Flying insects drop like a bomb.
Here are some other home remedies from Dr. Koob of the UH extension service.
https://www.ctahr.hawaii.edu/uhmg/downlo ... ecipes.pdf
Usually you would use a light oil like cannola or vegetable oil. You want to stay away from the animal fats, that tends to attract vermin, for the same reason you want to avoid animal parts in the compost pile. Lard likes to cake when it gets cold so it might not be a good thing on the plants.
However, cow milk makes a good fungicide for roses and powdery mildew on other plants.
Put your pantry to work, cinnamon has been used by orchidists for years as a natural fungicide sprinkled on orchid roots. You do have to repeat it though it doesn't last a long time.
The milk recipe varies from site to site 50:50 milk water to a 10% solution, organic vs skim milk. Whatever works! One orchid grower used 2% milk to dip her pruners in (after each cut) while cutting her orchids flowers to prevent disease transmission.
https://groundtoground.org/2011/12/27/na ... ur-garden/
Happy gardening in Hawaii. Gardens are where people grow.