How to Clean the Screen on a MacBook (5 Steps)

Turn off the computer, unplug the power cord and remove the battery. Whenever using liquid of any kind around a MacBook, or any computer, it is important to have all power to the unit turned off and removed to protect you from shock.
Dampen a soft, lint-free cloth with water. Don't use anything other than water unless it is purchased from an authorized Apple Dealer. It is important that liquid is not sprayed directly onto the screen.
Gently wipe the screen with the dampened cloth. Even using just a cloth and water it is easy to clean off most smudges and fingerprints from the screen.
Wipe the screen down with a soft dry cloth after it has been cleaned to dry any liquid still on the screen and prevent streaking.
Replace the battery, plug the power adapter back in and power up the MacBook. The screen will be crisp and clear. It is a good idea to clean the screen every month to prevent the build up of grime.
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How to Fill a Cracked Screen With Toothpaste (5 Steps)

Place a hand towel on a table. Place the cellphone on the towel with the screen facing up. Blow off the screen with a burst of compressed air. Wipe the edges of the screen with a soft cloth to remove any dust that has gathered there. Blow the screen off again with the compressed air.
Apply toothpaste to the end of the cotton swab. Wipe the excess toothpaste off the sides of the swab with your finger. Wash your finger with water.
Hold the swab in your right hand. Hold the cellphone down with your left hand. Place the covered tip of the swab against the screen at the left side of the crack. Press down gently as you drag the tip across the length of the crack. Remove the tip once the other side of the crack is reached. Discard the swab.
Wrap the soft cloth around the pinky finger of your right hand. Hold the cellphone down with your left hand. Place the covered tip of your pinky against the screen at the left side of the crack. Press down gently as you drag the covered tip of your pinky along the length of the crack. Remove your pinky from the screen once you reach the other side of the crack. Place the soft cloth aside.
Inspect the screen to see if the crack is no longer visible. If you can still see the crack, repeat the entire procedure again starting with the application of the toothpaste to the swab and the swab to the screen.
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