I remember the St. Helens eruption. 50 miles away everything was covered in a light layer of ash, and if you tried to wash it off your car you just scratched up the paint job. Insurance wouldn't cover it.
Volcanic ash is tiny particles of rock.
If you fly an airplane through a cloud it will sand off the paint on the plane. The rock will melt in the hottest part of a jet engine and resolidify in bigger chunks when it cools down.
I’m glad I live in Georgia. 😏