Below is 2 recipes for washing powder. I can't lay claim to the recipes. These recipes are from Down to Earth Check out Rhonda's blog she really has some great money saving tips and ideas.
CONCENTRATED LAUNDRY POWDER
4 cups grated laundry soap
2 cups borax (bunnings)
2 cups washing soda
Mix all the ingredients thoroughly and store in a plastic container with a lid. Use 2 tablespoons per wash. This powder will not make suds and this is perfectly okay.
LIQUID LAUNDRY DETERGENT
Makes 10 litres
You may add any essential oil of your choice to these homemade cleaners. Oils like tea tree, eucalyptus, lavender or rose are ideal. They are not necessary to the recipe but do not detract from the effectiveness by adding them. Use essential oil and not a fragrant oil.
1½ litres water
1 bar Sunlight or generic laundry soap or any similar pure laundry soap, grated on a cheese grater
½ cup washing soda – NOT baking or bicarb soda
½ cup borax
10 litre bucket
Slotted spoon or wooden spoon for mixing
Into a medium sized saucepan add 1½ litres of water and the soap. Over a medium heat, stir this until it is completely dissolved. Make sure the soap dissolves properly or the mixture will separate when cold.Add the washing soda and borax. Stir until thickened, and remove from heat. Pour this mixture into your 9-10 litre bucket then fill the bucket with hot water from the tap. Stir to combine all the ingredients.
The laundry liquid will thicken up more as it cools. When cool, store in a plastic container. I use one of those 10 litre flat plastic box containers with a lid. Use 1/4 cup of mixture per load or monitor to see what works well for you. I keep a quarter cup measuring scoop in the box to measure the mixture into the washing machine.