I saw this just not on craigslist and haven’t stopped to look this up anywhere else. Could this work?
1 tsp baking soda
1 qt of water
a few drops of liquid soap
spray the leaves once a week top and bottom.
We’ll have to see.
Liquid soap does spell doom for aphids. So if you have the bad type of aphids on your plants, a spray bottle filled with soapy water will do. But it also kills ladybugs and other beneficial insects.