[mlrtime]

I'm late to the discussion here, but I use shreddit. It edits and deletes all my past comments.

However I found recently there are websites that have every single one of my old comments accessible and I'm sure reddit itself does to. Once you comment it's there forever.

[doodlebugging]

This is also my experience. Editing or deleting comments on reddit doesn't permanently remove them since there are so many operators updating their own reddit streams in real time. It never goes away, it just takes a little more effort to find the original.