Scrubbing with plain soap and cold water will remove urushiol from skin if it is done within a few minutes of exposure.  Many home remedies and commercial products (., Tecnu , Zanfel ) also claim to prevent urushiol rashes after exposure. A study that compared Tecnu ($/oz.) with Goop Hand Cleaner or Dial Ultra Dishwashing Soap ($/oz.) found that differences among the three—in the range of 56–70% improvement over no treatment—were nonsignificant ( P > ), but that improvement over no treatment was significant at the same level of confidence. 
It seems strange, then, that allergic reactions to corticosteroids actually occur—especially since these medications are used to treat allergic reactions. While severe allergic reactions to corticosteroids are extremely rare, they do in fact occur. Most allergic reactions to corticosteroids are less severe, however, and result from the topical formulations—occurring in up to 6% of people. Allergic reactions to oral or injected formulations are rarer, occurring in less than 1% of people. Causes of allergic reactions to corticosteroids may be due to IgE antibodies , or as a result of delayed-type hypersensitivity reactions caused by T-cells (a type of white blood cell).