Try a Google search for 'Citrus Leaf Miner'.
Is that it?

From what you describe you have citrus leaf miner. Spinosad is the best material for the home owner.

yep, definitely leaf miner. i used organocide and it did nothing. i later used malathion and it was pretty succesful, best of all a few days later i witnessed wasps and bees around the trees, which is what you want ideally (wasps are leaf miners natural predator and sometimes spraying can detract pollinating honeybees)

never used it but i read spinosad works as well.