any removal is better than no removal. Mold will reproduce again, so you have a long term struggle on your hands. Once you get the remaining quantity of mold down below a certain amount, its colonizing activity will slow down, too. But your mission, should you choose to accpet it, is to eliminate all mold and all future growth. After taking the entire machine apart and cleaning it numerous times (with numerous methods including using plain water under the shower head), then you have to try to change the growing conditions inside your AC unit. Mold food and mold-appropriate conditions.
more later.
david