Please don't use any of the solvents and stuff I talk about in this video.

Instead you can use electrical contact cleaner which is now readily available and pretty cheap.
Comes in a spray can similar and you just shoot it in and you're good.
It is much safer for the plastic and much less risk of it getting to the screen.

How to restore unresponsive shoulder buttons on your Nintendo handheld without the need to take it apart.

Works pretty dang well, much more effective than blowing, which tends to restore functionality only temporarily.

It may not return badly worn buttons to a like new condition, This type of repair is most effective on buttons that may have have suffered a lack of use, or if the DS is frequently kept in dirty environments.

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