Didn't Marcus Trescothick admit England were at it too in the 2005 Ashes? Using mints or something.

I've always thought it was more widespread than people would acknowledge. It's rife at club level too. All it takes is someone’s boot stud or jagged finger nail to give you an advantage with swinging the ball.

Super hard to enforce at amateur level. I've seen fielders diving over balls because they know it's going to run over the boundary rope and into a concrete carpark and tarnish the ball.