There has been one common value

Of late I see more and more vehicles on the streets and highways around Salem that are sporting Commercial Vehicle Signage . . . in Spanish.

Today, it was a Package Delivery Service and I have seen others however was never able to understand exactly what the lettering or signs are promoting.

There has been one common value distinguishing them from most other commercial vehicles I usually see.

That is, they have all been unusually Dirty!