How to keep Google Chrome Pinned Most Viewed Thumbnails?

Hi, just wondering if there's any way to set up CCleaner so it will clean google chrome cache and all that stuff but keep the pinned thumbnails for my most commonly viewed sites (ie, homepage). Hope I made that clear enough.

Oh I tried adding the file "thumbnails" that's in the chrome directory to the exception list, but with no success - it also made the browser not clear out non-pinned thumbnails.

Any help is greatly appreciated, thx in advance guys.

anyone?