Clean DC jack with no visible marks or crumbs etc.

[koffee6654]

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?

 

[webworkings]

Have to apply pressure where exactly?