The USB port ?
- get a magnifying glass and use a small piece of wire, or a needle and be careful
- You can dismantle the bottom module to effect a better clean.
- you can use alcohol to clean out oily grime, best use 60% or more, Isopropyl Alcohol is sold for such at 90% +
Ideally if carry out any of the recommended options relay what you have done else everything may be repeated.
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