The drift is caused by an issue with the printed circuit board inside the JoyCon analogue stick. It has been engineered to a price with plastic sliders that move back and forth on pads as you move the stick. In most drifting sticks there is white dust all over the circuit board and often a build of dirt on the movement sensors. You cannot reliably "clean this" and the only solution is really to replace the analogue stick unit, preferably with an OEM part. You can do this yourself if you have the skills, or you can get someone to do it for you. Much cheaper than a new Joy Con and much faster that Nintendo repair.
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Re: Nintendo President Apologises For Joy-Con Drift, Can't Comment Further Due To Ongoing Lawsuit
The drift is caused by an issue with the printed circuit board inside the JoyCon analogue stick. It has been engineered to a price with plastic sliders that move back and forth on pads as you move the stick. In most drifting sticks there is white dust all over the circuit board and often a build of dirt on the movement sensors. You cannot reliably "clean this" and the only solution is really to replace the analogue stick unit, preferably with an OEM part. You can do this yourself if you have the skills, or you can get someone to do it for you. Much cheaper than a new Joy Con and much faster that Nintendo repair.