I did have to tell her not to wash the wheels first which she tried to do,
I always to the wheels, arches and exhaust first. Then with my best mitt and buckets, wash the rest of the car from the top down.
Leaving the wheels until last, means when pressure washing them, there is more chance of dirt spraying up the side of the car you have just washed. This means having to clean it again. More contact = more risk of swirls.