What was his job in the summer of 1968 at the meat packing plant? How did he remove the stuff?

From the text:

I spent the summer of 1968 working in an Armour meatpacking plant in my hometown of Worthington, Minnesota. The plant specialized in pork products, and for eight hours a day I stood on a quarter-mile assembly line—more properly, a disassembly line—removing blood clots from the necks of dead pigs. My job title, I believe, was Declotter. After slaughter, the hogs were decapitated, split down the length of the belly, pried open, eviscerated, and strung up by the hind hocks on a high conveyer belt. Then gravity took over. By the time a carcass reached my spot on the line, the fluids had mostly drained out, everything except for thick clots of blood in the neck and upper chest cavity. To remove the stuff, I used a kind of water gun.