Plugin that Removes Unused Images?

So, as everyone knows, WordPress creates a bunch of thumbnails when you upload an image. Is there a plugin that will:

1) Check if a thumbnail is being used in a post

For example:

<a href="image01.jpg"><img src="image01-450x450.jpg"></a>

Then it detects that both image01 and image-450×450 are being used.

2) Check if a thumbnail is being called as the post-thumb

For example, if I have the 165×95 thumbnails appearing next to every post on my home page.

3) Delete any thumbnails that aren’t being used for each individual post?

After running a WordPress site for eight years, all these extra thumbnails really add up. I wouldn’t mind clearing some space.