What is Fels-Naptha?

Fels Naptha is a laundry bar soap that is a traditionally used ingredient in many of the do-it-yourself laundry detergent recipes, according to the Mother Nature Network. It has been around for over 100 years, but has been manufactured by Dial since 1988.

Fels Naptha has many other uses than solely as a laundry detergent; it can be a stain pre-treater, rash treatment, bug bite soother, soap scum remover, and a bug and weed treatment when mixed with water for the garden, according to the Mother Nature Network. One single bar can make a year's worth of laundry soap and is praised for its cost effectiveness.