There really is no need to unless you have shed problems or a messy situation (poo/blood/etc). I just fill a tupperware container about 1/2 to 1 inch deep, throw it in the microwave until my temp gun reads about 85 degrees, then soak them. If needed I add a little dawn dish soap, but I don't add it until after I put him/her in since they usually will drink the water once you place them in it.