Wipe self
Wiping after the toilet is one of the few routines where privacy puts the child alone in the room before the understanding is fully in place. The visual support below makes the step clear enough that it does not need to be explained every single time.
♀Girl wiping face
A girl wiping her face with two cloths.
About this visual support
Few daily moments are as private and as quickly independent as wiping after the toilet. The adult leaves the room long before the child really knows how many times to wipe, which way the paper folds, or what being finished actually means. The result is often quiet mistakes nobody sees until the laundry tells.
Pictures on the wall by the toilet give the child a silent helper. Steps such as folding the paper, wiping front to back and checking the paper can be shown once and then stay there. Many children settle just from knowing the order is fixed, no more and no less.
A concrete tip: build a small sequence that always ends with handwashing, so the routine closes on its own without you prompting from outside. Routined lets you place the same steps inside a daily hygiene routine, so the child meets the same order at home and at grandparents.