Depends if the wash has a sign about mud...also depends on how well he sprayed the floor towards the drain. I know out west a lot of them have outside bays that have signs stating for trucks or muddy vehicles. I usually try to get the majority of the crap off before I drive home.
I know the spray washes around my house ask not to use if you have excessive mud/dirt.
I know the spray washes around my house ask not to use if you have excessive mud/dirt.