Supplies:

• A large bucket (I use a 3-gallon bucket)
• A large stockpot
• Something to stir (I use the wooden stir sticks that come free when you buy paint)
• Containers to store it in (I use 3 clean, gallon-sized, plastic milk or vinegar jugs)
• A cheese grater
• Measuring cups
• A funnel

Ingredients:

• A bar of Fels Naptha laundry soap (found in the laundry section, or you can use Ivory, which I've done, but I like Fels Naptha more.)
• Arm & Hammer Washing Soda (NOT Baking Soda! Found in the laundry section.)
• Borax (Also found in the laundry section.)
• Fragrance Oil scent of choice OR a bottle of liquid Fabric Softener

Always label your huge bags of white powder.

Directions: 

1. Fill your Stockpot with 10 pints of hot tap water (this comes to 20 cups if you need a quick conversion), and heat to very hot and steaming, but not boiling.

2. While that's heating, finely grate your bar of soap.

grated.

3. Measure out 1-1/2 cups each of Washing Soda & Borax.

measured.

4. When your water is steaming, but not boiling, add in the soap and stir until completely melted.

5. Then add in your Washing Soda & Borax and stir until completely dissolved.

6. Pour about 1 liter of hot tap water into your bucket and then pour in your hot soap mixture and stir.

7. Fill up to the 3-gallon mark with hot tap water and stir well.

8. Stir the mixture well about every 30 minutes until cooled. This keeps it from gelling too much. If you forget and it turns into a big bucket of jello, don't freak out! You can use your hands to squish it up enough to pour into your jugs to shake. (Borax burns. Use gloves.) If you have a paint-mixing drill bit, you can use that.

Alternatively, you can let it cool for a bit and pour it into your 1-gallon containers to finish cooling. Cap and shake every once in a while BUT DO NOT LEAVE CAPPED!

Word of warning: Leave the caps off while it's cooling! Or you might come back to half-empty containers. I did this and the heat caused the jugs to contract and it slowly squeezed up and through the edges of the closed lid. Sad face.

not urine.

9. Once completely cooled, you can scent the whole bucket at once, or you can divide it into your containers and do 3 different scents. I use about 10 full droppers (the dropper that comes inside the lid of the oil, full) in each gallon container, so 30 full droppers for the entire bucket. It sounds like a lot, but it really isn't considering the amount of liquid you're scenting. If you're measuring it out, that's about 1 ounce for the whole bucket. 

A variant on using Fragrance Oils for people who love the scent of their Downy fabric softener is to add a couple of cap-fulls of that instead of fragrance, and at $3.99 for a bottle, it will save you on the overall cost too.

Use 1/2 cup of this laundry detergent per large load. I use the gallon bottles to refill an old detergent bottle because the measuring cap is the perfect size. Remember to shake before use!

Cost

If you already have the supplies, the ingredients are pretty cheap and last for a while. The Washing Soda and Borax will make a little over 9 gallons, so here's the math:

Fels-Naptha: Usually about $.99 per bar
Arm & Hammer Washing Soda: $3.24 at Walmart
Borax: $3.79 at Kroger
Fragrance Oil: Approx. $6.99 for a 4 oz. bottle where I buy it.

  $2.97 (Fels Naptha, 3 bars)
  $3.24 (Washing Soda, 1 box)
  $3.79 (Borax, 1 box)
+$6.99 (4 oz. bottle of Fragrance Oil)
$16.99 for 9 gallons, or $1.89 per gallon!

Even the cheapest laundry detergent from the store is about $10/gallon, so these are some sweet savings AND you get to custom-scent your clothes!

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I love hearing how people get on, so leave me a comment letting me know if you've tried it and how you like it. I'd also love to hear other variations. Thanks!