Home-made soap solution for insect control on plants:
Empty gallon bottle (you can reuse the empty gallon of milk)
Empty Spray Bottle
Mix 2 tablespoon of baby shampoo in 1 gallon of water.
Note: Use a maximum of 6 tbsp. per gallon on water. Through coverage of the pest is necessary. Avoid using soaps on plants with hairy leaves or with very thin waxy coverings on the leaves.
I hope you can put in good use this tip for your own garden.