The holiday season has ended. There are still spots where rum punch, tomato sauce, mushroom gravy and red wine are flourishing. These spots are on ties, shirts, skirts and sports jackets — places where meatballs and deviled eggs made crash landings Christmas Day, places where Cabernet Sauvignon made splashes on New Year’s Eve. Stephen Hartz can put in the fix. As principal laundry man at Hartz Family Cleaners in Schenectady, he has been cleaning and steaming clothing that people wrinkled and wrecked during the final days of 2012.