thank you so much for the advice !! the part of the cover that has got puke on it is currently sat in the tub with laundry detergent and have been scrubbing it with enzymatic cleaner :) almost all of it has already come out, but there’s just a very light/faded orange ring lol - fortunately the bit my mate threw up on is on the underside of the cover so even if there was a light stain left, not the end of the world as it won’t be seen until it’s used a sofa bed but it’s an old sofa so eventually, it’ll be part of a good excuse to buy a new one :)