I have been going to Jerri’s Cleaners since I moved to New York in 1993. I maintained a friendly but detached relationship with the staff there for the first twenty years. Then a serious stain threatened a favourite pair of trousers and the relationship changed. Through several rounds of – ultimately successful — experimentation, I gained a sense of the lengths to which a true professional will go to avoid failure and please a customer. Recently I invited my dry cleaner over to discuss his working method.