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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