No need to clean if not oily. I would reapply the blue very sparingly. I have not found it to be reusable after initial torque is removed. This is SOP for production environments.
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My policy with blue is to clean and reapply. Only the green kind is supposed to be reusable. Reused blue will hold better than no thread locker, but not as well as fresh blue on clean threads.
Originally Posted By The_Reaper: Damn. Well, looks like I have a project for tomorrow then.
I wouldn't get too anal about it, just wipe off the old blue with a rag or paper towel or wire brush. I wouldn't worry about getting it 100% off. Then just put another dab of blue on and you should be good to go.