The sad thing is, only types 1 & 2 plastics are recyclable in any real fashion, and sometimes not even then.
That means types 3 through 7 are better disposed of in the trash, where at least they’ll be sealed into a landfill instead of being shipped overseas to end up somewhere far less environmentally secure.
These types are the numbers inside the recycling symbol. Many things are mixed and matched - a plastic bottle might be a type 1 (recyclable), yet its screw-on cap is typically a type 5 (largely non-recyclable). Always try to find the recycling symbol and dispose of anything not a type 1 or 2 in the trash.