TE joystick stiffening overtime

The joystick on my TE has become stiff, now the maneuverability is significantly diminished, I’m constantly fucking up inputs and dashes.
I’m wondering what I can do to loosen it up? I was at Arcade Infinity a couple months back and saw the manager apply a kind of grease lubricant to the stick on one of his SF4 machines that had become stiff. Not sure what he used but it worked well, the joystick felt like new right after.

Anyone else had this problem after putting some mileage on their stick or know a solution?

its happened to me. i opened up the joystick and noticed the pivot was really dirty. cleaned it off and lubed it up before putting it back in. feels like OEM again.

thread on joystick grease/lubrication: