I'm guessing you are thinking one of three things...
1. Homemade laundry soap users are crazy. It's not worth the time/money/energy. Just buy it at the store.
2. Well OF COURSE I know how to make it... I wouldn't survive without it!
3. Oh yeah... I was going to try that once. I lost the recipe and haven't taken the time to look for it again.
What you need:
Cheese grater (get a cheap one from the dollar store for just this purpose)
Large air tight container
Fels-Naptha bar soap (Found in the laundry section at your local store... try Kmart or Target if your grocery store doesn't have it.)
Nearly every recipe I've read has the amounts a little bit different for each ingredient. I made mine like this because If you don't like the amounts I have listed, mix in amounts that work better for you.
Grate one bar of Fels-Naptha laundry soap and mix it in the air-tight container with one 55oz box of Washing soda and half of a 72oz box Borax. (Save the other half for your next batch.)
Mix well and use a small scoop... a tablespoon or two for each load.
The lemony smell from the Fels-Naptha freshens any load of laundry... you will be amazed if you've never used it before.
This is especially true if, like most busy people, you have a tendency to leave the laundry sitting for half a day before switching it to the dryer... it doesn't make the clothes mildew-proof... but you can rest assured that starting the washer before you head out to work with the intention of switching it after you get home will not leave you running the load a second time!
Have a blessed week!