Note: This will work with a xbox360 controller too.
1. Use a damp paper towel.
2. Use a wet wipe (Note: This may make your controller feel sticky but is very good at cleaning a controller)
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[multipage=Hard to reach areas ][Hard to reach areas]
1. Use a damp q-tip , or damp cotton ball.
2. In side controller , sticky buttons , You must take apart your controller and clean it , theres no other way i know.
I know this sounds a bit bizzare but using a toothbrush actually cleans it well u can brush the side bits and the buttons and all the muck and crap will come out XD