Like the guys at the airport (except this stuff actually protects something)
Glass of wine? Pet slug? Sea captain covered in octopus guts? Sentient mud golem? Thermos of coffee thrown in frustration? Cosplayer from Dexter? Zombie jamboree? All this and more can now occur on your favorite couch! With these furniture protectors in place, your stuff is safe from almost any mess, be it pet mess or ectoplasmic slime ghost.
Although if you're having issues with an ectoplasmic slime ghost, maybe you don't want to waste time on getting furniture protectors. Maybe you want to just get out of the house. Or perhaps call the media and get some attention. Sell a few tickets maybe. People would flock to buy a couch covered in actual ectoplasmic slime.