[gswordsman]

How do I remove the those black deposits from a spark plug slot? Because I can't screw in the spark plug all the way in with the deposits blocking the path. I just changed all my spark plug yesterday and my car will just turned off by itself when I stop at a red light for a while, so I decided to check all my 6 spark plugs so I unplugged them all and only 1 spark plug has a lot of black greasy deposit so I get a new spark plug and plug in all my other spark plug and this slot with a lot of black deposit will not let my new spark plug go in any further than a few rotation with my socket wrech, other spark plug slot will allow me to do at least 10-15 rotation with socket wrench but this greasy deposited slot will only go around 5 rotation then I can't rotate my spark plug with my socket wrench anymore, so I unscrew the spark plug and poke a wood stick into the slot and I can feel a lot of deposit was in that slot while other slot was smooth going when I poke the wood stick in there. So how should I remove all that deposit from a sprk plug slot????? Please help.