XF 1.4 Clear contents of Proxy Images

I recently enabled Proxy Images on my server and then within 24 hours hit my server storage limit.

I disabled the Proxy Images, and ran some cleanup routines, but I'm limping along with just a few hundred MB of space on my hard disk. My proxy settings are: Lifetime - 1, Refresh - 0, and Image Proxy is still turned off.

Is this the directory that Proxy Images are stored in? internal_data/image_cache

If so, how do you clear and empty this directory, it's about .6 GB, or will it automatically clear itself?

I'm probably going to need to upgrade my SSD storage space....