Instead of planning on EQ or whatever for your next recording, spend some time figuring out the cause of the noise then eliminating it at source. As others have said, chances are something is moving or bumping something else--or an overhead fan is rubbing or your neighbours are enjoying a good sex life.
Whatever the cause, a mix of adjusting mic placements etc. or sorting out room problems will likely get you a clean recording. It is ALWAYS worth getting your original tracks as good as possible rather than trying to "fix it in the mix".
The pessimist sees the glass as half empty. The optimist sees it as half full. The realist just drains the darn thing and gets a refill!