Isn't This Obvious?

Okay, you know how they sell those CD/DVD laser eye cleaners in stores? Yeah, the ones that have the bristles on them, and you put the disk in your CD or DVD player/drive and it cleans the laser inside.

Can someone tell me why they just don't install a button on a DVD player that you press, and have the player itself clean the laser eye?? Wouldn't that just make sense?