One such product is IvyBlock, manufactured by Enviroderm Pharmaceuticals and available in most drugstores. IvyBlock contains a chemical bentoquatam - which prevents the urushiol oil from penetrating the skin. It s recommended that you apply IvyBlock at least 15 minutes before the risk of exposure, then again every four hours. IF washing begins within a few minutes of contact with urushiol. Don t use warm or hot water that will spread the oil and open skin pores to let the stuff in.
Soap also can help wash away the urushiol.
Better yet is a solvent such as alcohol or gasoline. Gasoline can burn the skin itself, so don t leave it on for more than a few seconds without washing with soap and water. Nasty things, those Toxicodendron plants. One can only hope that exposure to them is infrequent, and minimal.