Periodic cleaning of your ball transfers will help to maintain performance, decrease sound and prevent damage to the bottom of the dome. If your Core-Tex is not moving as smoothly as you like, then you will need to clean the ball transfers. This video takes you through step by step along with recommendations on a few drops of lubricant. IMPORTANT Avoid use of any lubricants that can break down ABS plastic after prolonged exposure.  Certain lubricants will chemically interact with the ABS causing damage.  A silicone based lubricant is safest on plastics.