there is this thing called an ozone machine, i think, that basically blows ozone into the air and it attaches to "impurities" in the air and causes them to fall to the ground because they become too heavy to float, i know they will kill the potent odors that i have produced in the past, and one of my friends said it took out the "male cat pee" smell out of carpet which is especially potent. From what i hear they are somewhat expensive and i have no idea what they do or don't do for cf lungs but i wouldn't think it would do anything. Hope you get the smell out. Also does the chair have a removable cushion like some couches? if so it'll have a zipper at the back of it and you can just replace the foam cushion inside it and wash the outside cover. it worked for the couch where i spend a lot of time lol.