Hi Volume,
On the wings and the flaps most of it are already blown away before rotation, and once the gear is up, the wing is clean again.
There shouldn't be any anti icing fluid on the flaps because the de / anti -icing is performed with the flaps up (0).
The front of the wing should clear of fluid first as it runs back due to the airflow. The Slotted Fowler Flaps ensure the airflow is better attached, so the last exposed section of flap should clear of fluid rapidly.
I'd expect the drooped ailerons to clear last, because they are at a greater chord angle than the wing.