What happens to dirty cans and bottles?

Recycling is a good idea , but my friend was using his can and water bottles as ash tray 🤮🤢
So what happens to dirty plastic

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ArishMell · 70-79, M

Both metals and plastics would be cleaned, but recovering metals involves melting them so that would boil or burn off contaminants anyway so they might not need prior washing by the processors.