Comments are usually very helpful and valuable. However, sometimes it happens that comments to answers or questions become obsolete, and can distract from valid comments. For example:

* Comments suggesting migration of a question could be removed after the migration.
* Reminders to post a minimal example could be removed by the commenter after the question has been edited to include an example.
* Comments pointing out a small typo or mistake could be deleted after the correction has been done.
* A long discussion via comments, which came to a result and for example to a revision of an answer, could be cleaned up by the writers. Also, if they decided to continue in the chat, in that case a remaining link to the chat log would be sufficient.

I mean cleaning up by original posters of comments, to remove noise and to keep the site tidy. It might be especially helpful if there are further but still valid comments. Keeping in mind not to leave gaps if there are already follow-up comments - should we encourage users to clean up a comment from time to time, if meaningful, as etiquette?