How to make your own washing powder | eHow- how to make washing powder lemon powder lemon powder ,Fill a large bowl with 2/3 to 3/4 of a gallon of water. Hold a cheese grater or rasp over the bowl and begin grating the soap into the water, stirring to prevent the soap from sticking together.How to Make Baking Powder Substitute With Pantry Staples ...Ran out of baking powder? Try these clever baking powder substitute ingredients to make baking powder in a pinch with staples you already have stocked.