We find our customers sometimes add screenshots into their comments which contain data which we believe shouldn't be public. For example this could be a screenshot taken from another application or from our application containing the customer's data.
You cannot currently remove an image individually from a comment in the same way you can from an idea. The only current solution is to copy/paste the content of the comment into a new comment and delete the original.
The status of this idea was out of date. It is now possible for users in Aha! to delete images from comments made by ideas portal users.