It is not the actual scale as you see on the skin but the part to be shed or covering. The scale design is permanent but it's covering must come off.
On Eastern Diamondbacks and some Timber Rattlers I've used a steel brush to remove scales but generally on thinner skins like some timber rattlers, copperheads and the Western Rattlers use your hand, an artist eraser, steel wool, duct tape, etc. Whatever works for you, but get them off. They will get cloudy under the finish.