PVC should be washed in warm soapy water, rinsed and left to drip dry. The PVC should not have any massage oil, aromatherapy products etc coming into contact with it. PVC should not be stored next to latex or Rubber. The above products will "release" chemicals in the PVC which keep it soft. Sweat also has salts which may cause the PVC to harden over time, so sweat should be washed off. Silicon and water based products are safe to use with PVC. Once PVC has hardened there is nothing than can be done to re-condition it. PVC produced by PVC-U-LIKE is safe worn next to the skin but not for long periods because the skin will not be able to breathe and this will cause a reaction.