Commercially produced laundry soap contains chemicals that sometimes cause allergic reactions on the skin of sensitive individuals. If your skin reacts poorly to standard laundry soap, use an old-fashioned recipe for a washing powder bar soap that has no chemical perfumes or dyes. Make basic laundry soap from ingredients purchased at a soap-making supply store, like lye and tallow.
Place the tallow into a pot and heat the tallow until it melts.
Pour the water and lye into a glass cup. The lye will dissolve in the water.
Pour the lye water into the tallow and stir the mixture for 20 minutes until it thickens.
Pour the soap mixture into soap moulds. Place the moulds into a dark room for six weeks.
Pop out the laundry soaps from the moulds. Cut up the soap bars to use in your washing powder solution.