There are two ways to clear Messenger's cache, depending on whether you're using an Android, or an iPhone or iPad.

You can delete Facebook messages using the Facebook Messenger smartphone app, or the Facebook website.

Here’s how to deactivate (and reactivate) your Facebook account temporarily, or if you’re planning on quitting the platform, how to permanently delete your account. Here's how to temporarily ...

I created a temporary account with windows messenger and now can't figure how to clear the account and start over. I sign up a month ago but never wrote the password down and can't get it reset.