Step 1: The Materials
1 Rubik's cube
1 screw driver (optional)
1 can of Silicon oil
Step 2: Taking the Rubik's cube apart
If you are using a store bought cube it is probably really tight. The tighter the cube is, the harder it will be to get it apart. BE CAREFUL.
Turn on side of the cube 45 degrees and pry one if the edge pieces off with the screwdriver. If you have a DIY cube with adjustable spring tension you can probably just use your thumb.
After removing the edge take all of the pieces off and make a nice little pile.
Step 3: Cleaning
Using the tissues rub the residue off of each part. Make sure you get the undersides of the center pieces.