Facebook Messenger: Delete non-friend contacts?

I've posted a lot on the Facebook Marketplace to sell items. As a result of that, I've gotten a lot of messages from strangers. I always delete our conversation thread, but I noticed they stay in your "Contacts". I have hundreds of contacts that are not my "friend". Is there a fast way... show more I've posted a lot on the Facebook Marketplace to sell items. As a result of that, I've gotten a lot of messages from strangers. I always delete our conversation thread, but I noticed they stay in your "Contacts". I have hundreds of contacts that are not my "friend". Is there a fast way to remove non-friends form Messenger?
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