Oh phew...i was worried. I mean sir Poopsalot went to the vet a week ago and is apparently the vision of health, but of course sometimes after dry food we'd find a little gift on the blanket on the couch where he'd thrown it back up. We don't leave a whole bowl out for him to graze on anymore because, as much as i love him, he is a guts.
Any sort of stain spray for clothes or other does the trick. I removed whatever food i could with paper, spray the stain, scrub with a sponge, then spray and scrub again to be doubly sure. That's if you don't want to put the thing into the wash by itself. Otherwise i think just remove the food, spray and throw into the machine.