What is a non toxic treatment for aphids?

Use horticultural oil

LADYBUGS!! PLANT some ladybug attracting plants around where they're most active & the ladybugs will come & eat the aphids. Aphids are their favorite & they won't bother your plants. Google ""What plants do I need to attract ladybugs?"" & you decide which ones you like the best for your yard. There are all different kinds. GOOD LUCK

http://homeguides.sfgate.com/attract-ladybugs-praying-mantises-garden-29008.html

ladybugs are the best solution. Can spray a mixture of a qt of water and teaspoon of Dawn

I agree Mix at of water and a teaspoon of Dawn. Then spray it on the plants

Lady bugs!

Diatomaceous earth. Completely natural and safe. Just sprinkle it on the plants.

Depending on the size of the problem, you can mix a tablespoon of dish soap with a gallon of water and spray all the surfaces of the plant. Aphids have a waxy coating which the soap destroys and they'll die. This will work great for houseplants and a few potted plants but not for a garden. For that, I'd try a horticultural oil spray. Look for it in the gardening section in many stores.