I have a stray that his fur is very greasy to almost a nasty point.?

His rt. eye stayes go-oped up, to where it has to be cleaned out every day; ( I wear gloves ). He has a awful, almost rotten stench to him at times. Hes a older cat, hes missing teeth, and he IS a very loving cat (as long as I have gloves on ). I'd rather not tell you what my Husband wants to do. Do you have any answers for this stray I named Fredrick?