How do you get rid or air bubbles in a touch screen?

You take your screen pertecter of and put it in sopy water and rub it with your fingers then leave it some were clean to dry and then wipe your iPod touch with a cloth and make sure theres nothing on the screen nothing at all then after there both dry place the screen protecter over your ipod touch and then get a credit card and romove.some of the bubbles :) hope i helped