Disassemble and remove anything attached to the carriage of the rail you wish to clean.
Move the carriage to one end of the linear rail.
Apply a small amount of 99% isopropyl alcohol to a lint-free paper towel.
Wipe down the length of the rail with the paper towel, ensuring that you grip the sides of the rail tightly. This will allow the paper towel to clean the groove down the side of the rail, as well as the other surfaces.
Depending on the amount of dirt and debris present, repeat this as necessary.
Carefully slide the carriage to the far end of the rail and clean the area previously obscured.
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