Hydrogen Sulfide gas is highly toxic and stinks terribly. It’s often used in suicides where the victim turns their car into a gas chamber. Do you think it ruins the upholstery? I would assume so, since cigarette smoke can be smelled if a smoker drove the car. But they have ways of cleaning it. I wonder if it’s possible with hydrogen sulfide or if it has to be completely reupholstered. Not that the suicide victim has use for it, but it is an asset than can be left to people they care about.