Here’s my Free Office Supplies Only method:

Soy sauce on the control key, took a sticky note and edged it down along the top edge of the key until it was under enough to pull up and gently dislodge the key. Snapped a wooden stirring stick in half and pulled the loose filaments out, then dampened it to use it as a fiber brush.

To re-insert, I slid the sticky note back under the top of the scissor switch in the key socket to keep it elevated, and reattached the metal hinge to the key and slid it up into the plastic hooks. I pressed down firmly from the bottom of the key to get those two little plastic bits on the bottom of the key piece into the spaces on the key socket, and then pressed down on the top until the top of the plastic switch snapped into the two little holes facing each other on the underside of the key, then removed the sticky note.

It stayed pressed down until I slid the sticky note back under the key from the top, and pulled up gently a few times. Key became springy again, with no stickiness.