Question: To fix a stuck SNES controller button.
Options:
Try using an old toothbrush to scrub around the offending button and use the bristles to pick up dust dirt etc.
Try using an old nail file to scrub around the offending button and use the bristles to pick up dust dirt etc.
Answer: Try using an old toothbrush to scrub around the offending button and use the bristles to pick up dust dirt etc.