irotsoma
The city of Seattle only recycles certain types of plastic containers through ordinary home and public pickups. They don't melt down polymers except in specific circumstances with specially scheduled pickup, they mostly only clean and resell plastics. Generally plastic or paper cups are recyclable if they are "clean". Styrofoam is not recyclable in any form. 

Here's a great tool for determining exactly where stuff goes, compost, recycle, or trash though not many places have the compost option for the streetside bins: https://www.seattle.gov/utilities/your-services/collection-and-disposal/where-does-it-go#/a-z