How to clean 3DS cradle contacts?

AnimalCrossingPerson

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It's been worsening over some time but it's now gotten to the point where it's starting to bug me. My 3DS will struggle to charge with the charging cradle, either only working when shifted to the left or right, when the battery low, whatever.

I tried cleaning the contacts with some damp tissues and a pencil, which made some difference but didn't clean in the corners of the contact indentations. Any other suggestions?
 
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