The Best Way to Clean a MacBook

Shut down the MacBook completely. Unplug the power source from the machine and remove the battery.
Wet the micro fiber cloth and Magic Eraser with lukewarm water. Wring both of them out so that they are damp, not wet, and no excess moisture can be seen.
Wipe the screen and exterior of the MacBook using the damp microfiber cloth. This is the method recommended by Apple.
Use the magic eraser combined with a light dab of baking soda toothpaste to remove trouble spots in common areas like the track pad and palm rest areas. Use of white toothpaste only suggested with traditional white MacBook models.
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How to Fix MacBook Water Damage

Power off your MacBook as soon as it gets wet. If your MacBook was off when it got wet, do not power it back on. Powering the computer on can cause the water to short out some electrical components, and can cause permanent damage to the computer.
Remove the battery, and use a towel or other dry cloth to wipe off any water on the outside of your MacBook.
Fill an airtight container large enough to fit your laptop with dry, uncooked rice, then place your laptop in the container and seal it.
Leave your MacBook in the airtight container with rice for 24 hours. After 24 hours, if the computer still appears to have water in it, return the MacBook to the rice container for an additional 24 hours. If the computer appears to be dry, attempt to power it on.
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How to Clean a Laptop Touchpad

Turn off the power to the laptop. You can also unplug it and remove the battery to avoid any potential short of the system or shock to you.
Dampen a cloth lightly with the distilled water. Dab off any excess onto the second cloth or dry part of the same cloth. Rub the touchpad with light pressure to remove the dirt. Dry with the second cloth.
Mix one part distilled water to one part isopropyl alcohol in a bowl or cup for a stronger cleaning solution if necessary. Moisten the cloth with the solution and rub the touchpad with light pressure. Wipe dry with the second cloth.
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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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How to Clean a Moshi ClearGuard

Remove the Moshi ClearGuard from the MacBook keyboard.
Dampen a cloth and apply a bit of dishwashing detergent to it.
Scrub the Moshi ClearGuard gently with the damp cloth, and then rinse it off with water.
Set the Moshi ClearGuard on top of the tissue paper. Allow it to air dry.
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