This one really works. An almost accidental discovery, maybe everyone already does this.
If you have sticky plastic 'rubber', rub it well with Bicarbonate of Soda powder using your finger till it feels dry. Then use a wet cloth to remove the bicarb, you may have to rub quite hard and you may have to repeat this.
It's a hell of a lot quicker than rubbing with alcohol, but you do need to take care not to get bicarb powder inside whatever it is you're fixing. It's quite possible that other water-soluble powders will work too, but I haven't tried.