I've never done well with soap sprays. I would guess that you got it too strong, and that dissolved the natural oils on the plant, which made it sun scald and burn the leaves, even though you didn't spray in full sun.
Met52 will take out your whiteflies, if you are looking for alternatives to Malathion, which is the chem rounte. Met52 is $60 a bottle, but I can get 2-3 years out of one bottle, and that is having a few hundred plants. Storing it in the refrigerator prolongs its shelf life.
The thing about spraying Malathion is that the protective equipment you should buy for yourself ends up costing ten times what the spray costs. So the cheap chemical spray is not that cheap if you factor in the costs of a respirator, gloves, glasses, and maybe a spray suit if you are extra careful.
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