Proper wording of a sign?

[Waxman]

When large vehicles enter my IBA, they sometimes go too far to the right and the wash arm impacts the right side mirror.

How can I word a sign to let the customer know that if their right side is raised up 5" off the floor and they can't feel that they have ridden up atop my right side guide rail, it is not a carwash malfunction that has torn their mirror off; it is their own error???

TIA
Waxman

 

[I.B. Washincars]

Retract folding mirrors. The mirror you save will be your own.

 

[DiamondWash]

Rocky: I see three of him out there.
Paulie: Hit the one in the middle.
Duke: Right! Hit the one in the middle.

 

[MEP001]

Maybe mount a mirror so they can see where their tires are. Maybe also put in a camera so you can show them they were on the rail and not between them.