how to fix buttons on controllers that are a bit sticky?

[SynthWizard]

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how to fix buttons on controllers that are a bit sticky?

<!-- SC_OFF --><div class="md"><p>I tried cleaning them</p> </div><!-- SC_ON --> submitted by <a href="https://www.reddit.com/user/Ophileah"> /u/Ophileah </a> <br/> <span><a href="https://www.reddit.com/r/synthesizers/comments/tek00r/how_to_fix_buttons_on_controllers_that_are_a_bit/">[link]</a></span> <span><a href="https://www.reddit.com/r/synthesizers/comments/tek00r/how_to_fix_buttons_on_controllers_that_are_a_bit/">[comments]</a></span>