In New Orleans they sell them in 50LB sacks like onion's or potatoes. We just dumped them into a large cooler with the drain plug open, and ran the garden hose through it for a half an hour or so. I have seen people use a cooler full of water and salt, but mostly we're just looking to clean them off before cooking them. The way we cooked them gave them flavor. If they come out of the pot and their tails are straight not curled, don't eat them! There are many different kinds of crab boil to use, and you have to turn off the heat and let them soak for 15 to 20 minutes after they have cooked. Now that we live in New York, we use the same technique with shrimp and scallops. I use a turkey frying pot with a strainer and add the following whole and cleaned: 2-3 lbs of small red potatoes, 3 onions, 4 garlic bunches (whole bunches not cloves), 6 ears of corn broken in half, and a package or two of little smoked cocktail weenies. Cook all that with the crab boil until the potatoes are almost done, then add the seafood. Cook everything together until the seafood is done, then turn off the burner and let it soak. Put some newspaper on a table, and dump the strainer of goodies onto the newspaper. I have about 12 neighbors who now pitch in and I do one of these every Memorial Day.