I would not know but the first thing I'd try would be compressed air, after that I'd put a stick of cotton dipped in alcohol in there....if still not ok then I'd replace the whole thing. At that point there would be nothing to loose by flushing it with alcohol.
Hi fmak,
A 8 is right. Compressed air. If that doesn't work (wet goo) clean it out with isopropyl alcohol, flush with same, then blow out with compressed air.