Dirtied

This seat, it's real leather, isn't it? It would be a disaster if some slip-up gets it dirtied.

The dripping ice cream dirtied his pants.

I dirtied one.

She dirtied a sheet.

Those damnable pigeons have again dirtied my car.

Who dirtied it?

They're the ones who dirtied them.

He dirtied them for you.