Some rubber parts are still provided with a (wax) layer when shipped: a mold release agent.
A cleaning solution with hot dish soap and water is enough to remove this layer.
Use rubbing alcohol for stubborn stickiness.
Although alcohol is an effective cleaner for most kinds of stickiness, you should only use this cleaning agent on rubber occasionally.
Dampen a clean rag with alcohol and wipe at sticky areas until they are removed. Rinse the rubber with water afterwards.
Exposing rubber too often or too long to alcohol may cause it to break down more quickly than normal.
