If it's dry and everything else is dry, it may be something old that was probably repaired already.
It's not like you stick your head down there every day, it could have been there all along, you just never noticed it. Have you owned the car since it was new? Maybe it was an issue that was taken care of by the previous owner. Maybe a brake or clutch master cylinder, as previously mentioned, that had been repaired a while ago.
My suggestion is check it periodically and see if you catch it when its wet. If it never changes, then it's most likely an old issue.
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