Fels-Naptha is an American brand of bar laundry soap used for pre-treating stains on clothing and as a home remedy for exposure to poison ivy and other skin irritants. Fels-Naptha is manufactured by and is a trademark of the Henkel.
The soap comes packaged in paper similar to bar body soap and is most often found in the laundry section of a supermarket or grocery store. It is intended for the pre-treatment of stains by rubbing the dampened product on a soiled area prior to laundering. The manufacturer claims it to be most effective in removing chocolate, baby formula, perspiration, and make-up.
The original Fels-Naptha, developed by Philadelphia manufacturer Joseph Fels around 1893, was used as a home remedy in the treatment of contact dermatitis caused by exposure to poison ivy, poison oak, and other oil-transmitted organic skin-irritants. Washing the skin directly with the soap helps break up the oils that carry the toxin. However, in its own caution use sheet, Dial Corp. stated that Fels-Naptha is a skin irritant and not to be used directly on skin. According to the manufacturer, about 1/2 of a bar of Fels-Naphta grated and added to a wash cycle helps eliminate residual stains.
Health Considerations 
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