To make just 1 gallon:
1 cup hot tap water
1.5 oz grated bar soap
1/4 cup Arm & Hammer Washing Soda
2 Tablespoons 20 Mule Team Borax
Add the grated soap to the hot water in a saucepan. Stir it over med-low heat until melted. Add washing soda and borax and stir until dissolved. Fill a 1 gallon jug half way with hot tap water. Add the soap mixture. Shake it up and then fill to the top with more tap water. Let it sit overnight to thicken. Shake before each use.
1 gallon = 128 oz = 16 cups = 32 half cups (extra-large top loader) = 64 1/4 cup (recommended top loader) = 128 1/4 cup (front loader)!
To make 5 gallons:
4 cups hot tap water
5.5 ounces grated bar soap (save your slivers for this)
1 cup Arm & Hammer Washing Soda (not Baking Soda)
1/2 cup 20 Mule Team Borax
Add the grated soap to the hot water in a saucepan. Stir it over med-low heat until melted. Add washing soda and borax and stir until dissolved.
Fill a 5 gallon bucket half full with hot tap water. Pour in the soap mixture and stir with a whisk, immersion blender, or paint stirrer drill attachment. Add more hot tap water and stir again. Cover the bucket and let it sit overnight to thicken. Transfer to gallon jugs and shake before each use.
5 gallons = 640 oz = 80 cups = 160 half cups (extra large top loader) = 320 1/4 cup (reg top loader) = 640 1/8 cup (front loader)
adapted from www.duggarfamily.com/recipes