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Just using OSE? I would arrange the links you export by PA. Start with the lowest number and work your way up removing the good looking links so you are left with the bad links If you want to use other tools, you can use scrapebox, or even http://nielsbosma.se/projects/seotools/ to detect their PR first. (or better yet, check if the link is indexed in google before checking PR) If it's deindexed, then you dont have to bother wasting your time on it. Put it on a separate list and contact for removal once you are done sorting out the links. If the link is not present anymore but the site is bad, disavow it. PS. I would also export links from google webmaster tools