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Use adams flea and tick spray on their faces. Don't spray it - use gloves and a paper towel rolled into a cone at one end. Spray the towel, use the pointy cone end to wipe their faces and under their chins. Nothing you use topically will kill the eggs. You have to retreat in 7 days when they hatch.
Now it's anecdotal that ivermectin might kill the lice as they hatch out if you use the topical pour-on. It's said to have 28 day effectiveness for lice in cattle. I do know for a fact it has 3-4 days effectiveness on lice, possibly more (testing currently).
With permethrin dust and adams and retreating, no egg-tossing is needed.
And with ALL cases of parasites, always treat the bedding, nestboxes, and bird. With mites you should also spray the cool (particularly roosting wood, joints, cracks) with the liquid 10% permethrin spray. They spend most of their time off of the bird, only get on some nights to feed.