Well, I washed all the sheets and bedding (at 60 only). No way to wash the sofa or the carpet (which is probably carrying it). Did a thorough clean of the floor and surfaces with bleach. Felt frustrated I lost almost a whole day of working because I was taking care of the house and her! I think the vet agreed that it's most likely ringworm (I just know from experience), but she took a culture which will take a couple of weeks (kind of pointless in my opinion because it'll have started to heal by then). She gave me liquid medicine, which my husband was advocating, but which cost over $500. (Because the cat is theoretically "mine", I cover all the expenses.) She also confirmed to clean it 2x a day with an iodine wash. The cream doesn't really work because she'll just lick it off, and in our small apartment I don't really want to suffer with dealing with the cone and all the subsequent whining that would entail. We do have a kitten at the moment which, knock on wood, doesn't have any spots of it right now. Of course the vet said it would be better to keep them separated, but she understood that that just wasn't going to happen in our small flat. The cats actually sleep on the bed with us, and we don't want to put up with the insistent meowing if we tried to keep them out. Sooo... it is initially a very uncomfortable feeling, but today I'm finding myself much more nonchalant about it and not bothered to try to keep everything as hygienic as possible. I've already got the fungtopic cream from previous foster kittens on hand if I start to get a spot.
My partner and I did have ringworm as kids... I've often wondered if we have any sort of "immunity" to it, but I know the vets and SPCA staff get it periodically from their work.