This picture is helpful for knowing the different types. #5 PP/polypropylene are some of the hardest to recycle; these are often plastic utensils and plastic straws. It costs more to recycle them, so it’s cheaper to just throw them away in a recycling facility. Same with #6, PS/Polystyrene, we know that styrofoam is some of the worst plastic known to man, creating micro and nano plastics like crazy and often very hard to recycle. Hopefully, restaurants can start offering better alternatives! ♻️