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I'd try flushing them for about a week, making sure to test the water's PH beforehand each watering. It's worth a shot, I think.

Without knowing more about what's been done, they look like they need more water. Were these recently transplanted? If so, did you test the soil you used? I'd check PH of both soil and water.

The problem of using any insecticide for this problem is that the insects you are hoping to destroy are not on the outside surfaces of the plant, but are feeding/mining in the soft non-cellulose portions of the leaves, where the plant's vascular system is located. Surface insecticides will not...

Those pictures look a lot like you have a leaf miner problem... insect infestation. Google "leaf miner" and check out the photos of other plants exhibiting the same symptoms.