Cleaning DVDs

Someone told me this isn't common knowledge: To clean your DVDs of smudges and fingerprints and even minor scratches that make them stick and skip in your player, put a drop of dish soap on it, run cold water over it, and rub it around with your finger until the soap is gone. Then just pop it back in the player and it should work better. This is especially useful for Netflix and rented DVDs where a lot of people have had their hands all over the discs.