Since the SpyderCUBE is made of ABS plastic and is through pigmented, please use dish washing detergent and warm water to clean the SpyderCUBE. It may take some force or even a stronger cleaner. Wash the SpyderCUBE carefully with warm water and dry it with a simple kitchen paper. Please do not use fabric (T-shirt, etc.) since this is usually washed and thus "soiled" with optical brighteners used in the detergent.