Introduzione
If your buttons are sticking and they cannot be cleaned from the outside, here is how you can clean it from the inside.
Strumenti
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To get into the controller, you will need to unscrew the 7 screws on the back.
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You will have to remove the bottom oval sticker to reveal the screw circled in orange.
 
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With the screws removed, turn the controller upside down. Insert the iFixit opening tool between the top and bottom casing to pry them apart.
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Separate the top and bottom casing.
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It is likely that the buttons will fall out of place, so as you open the controller, try to keep track of where the pieces go.
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There should be the four circular buttons labeled 1-4, four smaller circular buttons for the D-Pad, and three rounded rectangular buttons.
 
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Turn the top casing of the controller over to remove all the buttons.
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Wipe each individual button with a piece of cloth and rubbing alcohol.
 
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Un commento
What is the right side of dpad buttons when put back?
There a polish side and another with fabric numbers. What side have to be up and down?