I'm with Amy. I wouldn't use Ivory (that "99.4% pure" business drives me nuts--pure WHAT, exactly? Ivory contains animal fat, salt, palm oil, epsom salt, silica [think superfine ground glass], and coconut oil, saponified with some form of alkali, and fragrance oil. Ivory soap has had all its natural glycerin removed.) or any other commercial bar to make laundry soap. I'd use a very plain homemade bar, with no fragrance, that is NOT superfatted, if I wanted to make laundry soap. I do make soap from scratch, but I don't make laundry soap because in my experience it's a lot of trouble for something that doesn't work that great. (This is just my experience and opinion--I know tons of people who swear by the stuff.)
So, while I certainly am capable of making homemade laundry soap, I don't. I buy
Charlie's Laundry Powder , which contains both soap and washing soda. It's hypoallergenic, biodegradable, fragrance-free, non-toxic, front-loader and HE compatible, and cleans great. Since you only use a Tablespoon per large load of wash, a 3-lb. bag costs about 18 cents per load to use. If you buy it in the bulk 5-gallon bucket, the cost-per-load comes down to about
TEN CENTS per wash. They ship quickly, and shipping is FREE if you spend over $20.
I have ZERO financial interest in this company, they don't know me from Adam. I just have not been able to beat this product with anything homemade, either in cost (figuring in what my time's worth to me--I can handle spending a dime on a load of laundry when it means so much less work) or efficiency. I also LOVE their All-Purpose-Cleaner (which is also highly concentrated--you dilute it with water), which is what I use to pre-treat tricky stains prior to washing. I've also used it to wash everything from floors to dog crates to my hands to the dogs themselves. It's that gentle.
Geez, maybe Charlie's SHOULD pay me a kickback.