Premiere cs3- image cache metadata issue

[Justin Lovell]

neo 550318

Any idea how to delete the image cache?
I tried 'cleaning' the scratch disks, but they cache still remained there.
eg. i scrubbed a clip
turned off the look with the icon in the task bar
scrubbed the clip again
all the 'cached' image i previously scrubbed had the look applied still
all the new spots i scrubbed had the look removed.

- in After effects you can 'purge all' to clear this.
- in premiere, i'm not sure how to clear this.

Thumbnail clips in the bin are have vertical lines across them.
if i export a still frame, the vertical lines are in the image.
looks like a really bad VHS dub with analog vertical line smears.