Oil emulsion works pretty good. I use a commercial emulsifier and neem (1:5) but I really think I could save (lots of) money and go for any oil. 5% works great but you need to test it to see how the plants handle it, it wipes 95% in one application. I think the soap also needs a certain concentration to be really effective.
Spraying big plants is just so much work, luckily I never have many aphids on tomatoes (I have everything else though, spider mites, russet mites, some unknown things).
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