Is it considered good practice to clean up one's "useless" comments? Hovering with the mouse above the upvoting arrow of a comment shows the text "this comment adds something useful to the post". Therefore arguably the number of upvotes a comment receives equals the number of people who find that "the comment adds something useful to the post", and thus a comment with no upvotes is found useless by everybody. Is it considered good practice to remove comments of one's own after some time (say, a few days) if they have received no or only very few upvotes? There is a related question Cleaning up comments, but that question addresses such cleanup done by the _moderators_.

Too few users bother upvoting comments for this to make sense as a policy. In general, only very problematic or absolutely useless comments should be deleted on MathOverflow.

In order for MathOverflow to have lasting academic value, the MathOverflow community should strive to maintain as accurate an historical record as possible. A perfect historical record is impossible due to the highly interactive nature of MathOverflow but unmotivated deletion of contents clearly goes against this ideal.