“Dry-clean only” is probably a phrase that you have seen before. You see it on the labels of certain pieces of clothing—like jackets, trousers, skirts and so on. I know quite a lot about dry cleaning because every Saturday from the age of 15 to 18 I worked at a dry cleaning shop. It was my first job. It was not particularly interesting, and it was not at all glamorous, but, looking back, I think it was important.