Clean DC jack with no visible marks or crumbs etc.

Jan 28, 2019
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So, my laptop stopped working a while ago. So I held the power button and plugged in the charger. But soon I realize that I have to apply pressure to the charger for it to actually charge my laptop, and my laptop still isn’t really charging. So, I was just wondering if it has to do with the DC? And how do I clean it with no visible marks or anything on it?