I recently had my #4 glow plug go out and attempted to replace it. As far as my records show this plug is original from the factory.

Much to my sadness it was stuck in place and I almost rounded the hex bit forcing it out.

I heated the plug with Map gas and PB Blaster (in that order) and still no luck.

Today I drove the car to get it up to operating temp and I left the can of PB Blaster in the freezer. Sure enough soaking the glow plug in cold PB Blaster did the trick and I heard that reassuring crunch that I broke through the carbon.

My problem is though I can just barely see into the hole and it is coated in thick black carbon. I would like to clean the hole out, but I am unsure of what to use to avoid damaging the prechamber (I think this is what it is called).

Could anyone offer advice? I read in an earlier thread that simply getting a small brush in there to scrap off the gunk as well as cranking the engine to blow out the rest is a good way to do it. But the junk is really caked on so I don't want to venture any further without some sound advice.

Thank you for your help and sorry for the short story.

Edit:For those interested, I went ahead and use PB blaster and a pipe cleaner. Seemed to do a good enough job to clean the threads. Eventually I would like to get a reamer, but that will happen later on in life.

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-Typos courtesy of my mobile phone.