Of the various food containers made of recycled Styrofoam, egg cartons are among the easiest to make
Because egg shells keep the actual food to be consumed from touching the Styrofoam, used Styrofoam need not be as thoroughly cleaned when made into egg cartons as when made into other food containers
The main reason Styrofoam must be thoroughly cleaned when recycled is to remove any residual food that has come into contact with the Styrofoam.