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Abraham wrote:USA1,

I have to disagree regarding Glocks are designed to run dry. To be fair, I was taught this also. Glocks need lubing too.

If you doubt this, research Larry Vickers and what he has to say about this.

Larry was a first tier SF guy and is widely respected within the gun community.

I understand that Glocks need some lubrication. If you read my post carefully you'll see that I was referring to the internals of the slide.
I have had people bring me Glocks where the slide was dripping from over lubrication.

Just drop in the dishwasher.

But seriously, I would just give the breach face area a nice scrub with a brass brush and some Hoppes.
I would also completely disassemble the slide and clean all the parts and channels if you are comfortable with doing that. Just don't oil any of those parts as Glocks are designed to run dry.