* Empty, Clean, and Dry
* When in Doubt, Find Out
* Keep Bags Out
The page goes into detail on each. This isn't unusual in my experience.https://www.seattle.gov/utilities/your-services/collection-a...
Here's an online tool to help people identify the various kinds of recyclables and direct them correctly. It isn't easy and I doubt few Seattle residents know all of these.
https://www.seattle.gov/utilities/your-services/collection-a...
If everyone started sorting and cleaning according to these rules the fraction of usable recyclables would increase a lot.