Pour 1 gallon (3. 8 L) of water into a large bowl. Add 1/3 cup (78. 86 ml) of salt to the gallon of water. Stir until the salt is completely dissolved into the water. Place all your cleaned clams in the water/salt mixture. Let the clams soak for 20 minutes. Drain water/salt mixture. Repeat the process of soaking your clams in a water/salt mixture 2 more times.
Make sure the hinge of the clam shell is nestled in the area of your palm nearest your thumb. The opening of the clam should be at your fingertips. You can also press down on the clam a bit to give it some added pressure to make it easier to pry it open with the knife.