Very easy

Turn your whells to the very far right (or left), using a suction plew, remove the entire content of your power steering reservoir, refil with fresh atf derxon III fluid, and turn your wheels to the oposite direction, empty your reservoir, refil, and do it like this 2 - 3 times, adjust the fluid level as recommended and you're done

It's the easiest and cleanest way to replace your power steering fluid, and your entire system is now filled with fresh fluid! Ho ho, you're welcome