bacbbe5f_elphia_County_Master_Gardeners__How_to_DIY
[Management Method] Horticultural (Insecticidal) Soap [Who/What it Manages] Fungus Gnats, Whiteflies, Mealybugs, Aphids, Spider Mites (soft bodied insects) [How to DIY] 
Using original Dawn brand or Liquid Joy liquid soap only (nothing with additional power or chemicals): Combine 1 cup of vegetable oil with 1tbs liquid soap. Mix well. Dilute the mixture by combining 2tsps of the oil/soap solution per 1 cup warm (filtered) water and put into a spray bottle. Mix only what you’ll use in that day. Do not store. Spray leaves above and below. Shade for 24 hours after treatment to prevent burn. ! Commercial soap sprays are effective and if you read the label, you can find non-chemical based sprays that are premixed and have a longer shelf life.
Philadelphia County Master Gardeners
How to DIY