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Have you received a warning? Seen a drop in traffic/rankings? If so, then your best hope is to have them taken down - ideally by the person who built them. If that's not possible, get a spreadsheet together and list the actions you took on each crappy link. It's extremely tedious, but you can then link to the GDoc in your re inclusion request and show which ones were removed and which ones you tried to remove.

If you know the sites in question, look in your analytics refferal data for any traffic from them.