I was watching The Duggar's (the couple that has 18 children) and she said she makes her own laundry soap for about $2 and it does 180 loads!.. Feeling ambitious?.....
The Jim Bob & Michelle Duggar Family
She has some recipes too that she feeds her little army...
This site also makes the soap.....
Soaps Gone Buy - Where Soaps of yesterday are found Today!
I can't seem to find the exact ingredients for Fels Naptha soap.....
...... It said it kills fleas, hhmmmm ........