Detuning your ski edges for park

well i was wondering what you guys think the best way to detune your ski edges for the park. I was wondering this because it feels like i took a different approach to it the last few years inwhich i just slid the ski edge up against some metal.
 
Take them to a shop and find a staff member who is clued up on this stuff (or a snowboarder even) who can grind them dull.
 
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